./devel/boost-jam, Free, peer-reviewed portable C++ source libraries (Boost.Jam utility)

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Branch: CURRENT, Version: 1.78.0, Package name: boost-jam-1.78.0, Maintainer: pkgsrc-users

Boost is a set of free, peer-reviewed, C++ libraries. The emphasis is on
portable libraries which work well with the ISO C++ Standard Library.

This package provides the Boost.Jam module, a make-like utility. This
is the tool used to build Boost itself, and is based on Perforce Jam.


Required to build:
[pkgtools/cwrappers]

Master sites:

Filesize: 108081.592 KB

Version history: (Expand)


CVS history: (Expand)


   2022-01-10 02:23:31 by Ryo ONODERA | Files touched by this commit (13) | Package updated
Log message:
boost: Update to 1.78.0

Changelog:
Version 1.78.0

Known Issues

These are patches from library authors which were found too late to be fixed in
the release.

  * Boost.Build silently skips installation of library headers and binaries in
    some cases, see #104.
      + Fixed in PR#113, patch.
  * Boost.Atomic fails to build when targeting UWP, see #54. Patch.

New Libraries

  * No new libraries.

Updated Libraries

  * Asio:
      + Added an io_uring backend that may optionally be used for all I/O
        objects, including sockets, timers, and posix descriptors.
      + Added support for files, with new new classes for stream-oriented and
        random-access files. This feature currently supports I/O completion
        ports on Windows, and io_uring on Linux.
      + Added support for portable pipes on POSIX and Windows (when I/O
        completion ports are available).
      + Added support for registered buffers, which are optimised when using
        the io_uring backend.
      + Added experimental support for channels, that may be used to send and
        queue completions as messages.
      + Implemented improvements to experimental::coro.
      + Disabled aligned_alloc on clang when using an MSVC runtime.
      + Changed to use a faster implementation for ip::network_v4::canonical().
      + Added template specialisations for common uses to improve compile time.
      + Reduced the size of io_context executors to a single pointer.
      + Increased the small object buffer size for execution::any_executor and
        any_io_executor.
      + Fixed multi-signature handling when variadic templates are disabled.
      + Fixed compatibility with new versions of gcc and clang.
      + Fixed compilation on Solaris.
      + Fixed defence against Qt-defined macros when building with MSVC.
      + Improved error messages emitted by ssl facilities.
      + Fixed bind_executor compatibility with completion tokens.
      + Fixed build errors when BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT is
        defined.
      + Added missing move assignment operator to awaitable<>.
      + Fixed an access violation when using coroutines with MSVC, due to
        incorrect alignment of allocated memory.
      + Fixed a cleanup issue in experimental::parallel_group that occured when
        the execution context was shut down with parallel operations still
        pending.
      + Added clarifications to the documentation on concurrency hints.
      + Added documentation on error handling techniques for C++20 coroutines.
      + Fixed various warnings.
      + Consult the Revision History for further details.
  * Assert:
      + Added source_location::to_string.
  * Atomic:
      + Use process-local futex operations on Android for non-IPC waiting and
        notifying operations.
      + Added support for Linux targets that only define SYS_futex_time64
        syscall, such as riscv32.
      + Added a workaround for incorrect result of std::alignment_of on clang 8
        for 64-bit types on 32-bit x86 targets.
      + Added a ulock backend for waiting and notifying operations on Darwin
        systems since Mac OS 10.12, iOS 10.0, tvOS 10.0 or watchOS 3.0.
      + On Windows, corrected discrepancy between atomic-type
        ::always_has_native_wait_notify and the corresponding capability macros
        when targeting Windows 8 or later. The library will now directly use
        WaitOnAddress and related APIs from public headers and therefore
        require user to link with synchronization.lib if the user requires
        Windows 8 or later by defining BOOST_USE_WINAPI_VERSION, _WIN32_WINNT
        or similar macros. The library is linked automatically on compilers
        that support auto-linking (e.g. MSVC).
      + Added support for types with padding bits, except unions, on compilers
        that provide a way to clear the padding bits. This feature is supported
        by gcc 11 and MSVC 14.2 (compiler version 19.27) and newer, as well as
        other compilers supporting similar intrinsics. On compilers that don't
        allow to clear the padding bits, types with padding are still generally
        not supported with the exception of 80-bit long double on x86 targets.
        A new BOOST_ATOMIC_NO_CLEAR_PADDING capability macro is defined to
        indicate when clearing the padding is not supported.
      + Initializing constructors of atomic_ref and ipc_atomic_ref no longer
        use atomic instructions to clear the padding bits in the referenced
        object. This reduces the cost of the atomic reference construction.
      + Initializing constructors of atomic and ipc_atomic are now constexpr
        for enums, classes and floating point types. For classes and floating
        point types, the constructors are constexpr if the compiler supports
        constexpr std::bit_cast, the type has no padding bytes and no padding
        is required to implement native atomic operations.
      + In accordance with C++20, default constructors of atomic and ipc_atomic
        now perform value initialization of the contained object. For types
        without a user-defined default constructor, this means the
        default-constructed atomic will be zero-initialized.
      + Added a workaround for compilation error on AIX caused by the assembler
        tool not supporting numeric labels. (PR#50)
      + Added a workaround for compilation error with Visual Studio 2015 prior
        to Update 3. (#52)
      + See changelog for more details.
  * Beast:
      + This maintenance update brings minor bug fixes and updated CI
        reporting.
      + Fixed security vulnerability CVE-2016-9840 in zlib implementation.
      + Fixed WebSocket permessage_deflate implementation. This should result
        in an increase in compression performance when using Beast WebSockets.
      + Removed the test stream and test framework's dependency on RTTI. You
        can now use our handy test stream to check your embedded asynchronous
        communications code!
      + We'd love to know how you or your company use Beast, consider adding an
        entry to the Companies and Individuals Using Beast list.
      + See the full Release Notes for a complete list of changes.
  * Core:
      + Added a generic implementation to <boost/core/cmath.hpp>, enabled when
        BOOST_CORE_USE_GENERIC_CMATH is defined or when the platform does not
        provide the necessary facilities in <cmath>.
      + Added boost::core::type_name, a utility function that returns the name
        of a type as a string.
      + Added boost::span, a C++11 implementation of C++20's std::span (Glen
        Fernandes).
  * Describe:
      + Added has_describe_enumerators, has_describe_bases,
        has_describe_members.
      + Added enum_to_string, enum_from_string.
      + Added relational and stream insertion operators.
      + Added descriptor_by_name, descriptor_by_pointer.
  * DLL:
      + Fixed missing #include, thanks to Denis Blank (PR#54)
      + Dropped TravisCI in favor of GithubAction CI
  * Filesystem:
      + v4: path::filename and path::iterator no longer return an implicit
        trailing dot (".") element if the path ends with a directory \ 
separator.
        Instead, an empty path is returned, similar to C++17 std::filesystem.
        This also affects other methods that are defined in terms of iterators
        or filename, such as path::stem, path::compare or
        lexicographical_compare. For example, path("a/b/") == \ 
path("a/b/.") no
        longer holds true. (#193)
      + v4: path::lexically_normal no longer produce a trailing dot (".")
        element and omits a directory separator after a trailing dot-dot \ 
("..")
        element in the normalized paths.
      + v4: path append operations now consider root name and root directory in
        the appended path. If the appended path is absolute, or root name is
        present and differs from the source path, the resulting path is
        equivalent to the appended path. If root directory is present, the
        result is the root directory and relative path rebased on top of the
        root name of the source path. Otherwise, the behavior is similar to v3.
        (#214)
      + path::lexically_normal now converts directory separators to preferred
        separators in the root name of the normalized paths.
      + Optimized overloads of path::assign, path::append, path::concat and the
        corresponding operators to avoid unnecessary path copying and reduce
        the amount of code redundancy.
      + On POSIX systems, fixed absolute(p, base) returning a path with root
        name base.root_name() if p starts with a root directory. In such a case
        p is already an absolute path and should be returned as is.
      + create_directories no longer reports an error if the input path
        consists entirely of dot (".") and dot-dot ("..") \ 
elements. The
        implementation is no longer using recursion internally and therefore is
        better protected from stack overflow on extremely long paths.
      + On Windows, remove now supports deleting read-only files. The operation
        will attempt to reset the read-only attribute prior to removal. Note
        that this introduces a possibility of the read-only attribute being
        left unset, if the operation fails and the original value of the
        attribute fails to be restored. This also affects remove_all. (#216)
      + remove_all now returns static_cast< uintmax_t >(-1) in case of error,
        similar to C++17 std::filesystem.
      + Fixed a linking error about unresolved references to
        Boost.ContainerHash functions when user's code includes boost/
        filesystem/path.hpp but not boost/container_hash/hash.hpp and the
        compiler is set to preserve unused inline functions. (#215)
      + Added a workaround for MSVC and compatible compilers eliminating path
        globals cleanup in release builds. This could lead to a memory leak if
        Boost.Filesystem shared library was repeatedly loaded and unloaded in
        the process. (#217)
  * Geometry:
      + Improvements
          o PR#894 Optimization and refactoring of rtree queries.
          o PR#913 DynamicGeometry and GeometryCollection support in various
            algorithms (undocumented for now).
          o PR#922 DynamicGeometry and GeometryCollection support in distance
            (undocumented for now).
      + Solved issues
          o #867 Poor performance of rtree query iterator with nearest
            predicate for big k.
          o #870 Compilation error in boost::geometry::self_turns.
          o #896 Assertion failure in get_turns with
            BOOST_GEOMETRY_NO_ROBUSTNESS.
      + Bugfixes
          o PR#906 Invalid result of buffer on macos-11 with clang-12.
          o PR#921 Compilation errors with c++20 (various compilers) and gcc-5.
          o Various fixes in set operations and buffer.
  * JSON:
      + Standalone mode of the library is deprecated.
      + Allow external libraries to forward declare value_to and value_from.
      + Fixed signed integer overflow in number parsing.
      + Add support for /Zc:implicitNoexcept- on MSVC.
  * Lambda2:
      + Added special cases in operator<< and operator>> when the first
        argument is a stream, to allow std::cout << _1.
      + Added operator->*.
      + Added first, second.
  * Log:
      + General changes:
          o Updated detection of std::codecvt specializations for char16_t and
            char32_t for compatibility with C++17 and later. (PR#159)
          o Added support for C++17 std::byte type to receive methods of the
            inter-process message queue.
          o On Windows, when building the library for Windows 8 or later, the
            library will use nt62 tag in the version namespace to denote the
            target OS ABI. For example, the version namespace could be named as
            v2_mt_nt62. This name will be part of all symbols exported by the
            library. Use the BOOST_USE_WINAPI_VERSION macro consistenly when
            building Boost and your code to request the minimum target Windows
            version.
          o Improved performance of SSSE3 and AVX2 implementations of the dump
            stream manipulator.
          o Added support for CMake build system. Only library build is
            supported at this moment, Boost.Build is still used for running
            tests.
      + Bug fixes:
          o Fixed a race condition on POSIX systems in reliable_message_queue::
            open_or_create or the equivalent constructor. Multiple threads or
            processes calling open_or_create concurrently with sending or
            receiving messages from the same queue could end up corrupting the
            queue contents and potentially crashing the process. (#162)
          o Added a workaround for b2 install failing on Windows because of
            missing boost_log_setup library if
            BOOST_LOG_WITHOUT_SETTINGS_PARSERS is defined. (#164)
      + See changelog for more details.
  * Math:
      + Add support for cubic roots.
      + Add support for constexpr versions of various standard library math
        routines.
      + Add support for Bezier polynomials.
      + Improve worst-case tanh-sinh integration performance.
      + Disable inadvertant use of integral types in integration routines.
      + Minor update for erf approximations when the result is with 2ulp of 1.
      + Allow Bernoulli code to be used on platforms with no atomic integers.
      + Improve the mode of the non-central Chi Squared distribution.
      + Improve certain edge cases for <cstdfloat> complex-valued elementary
        functions, see #507.
  * Multi-index Containers:
      + Added contains to key-based indices (issue #35).
      + Added merge operations to key-based indices. The functionality goes
        beyond the standard specification for (unordered) associative
        containers in a number of ways, most notably:
          o The source index can be of any type, including non key-based
            indices.
          o Partial merge is provided: for instance, x.merge(y,first,last)
            merges only the elements of y within [first,last).
      + Previous versions of splice for sequenced and random access indices
        were destructive, i.e. elements were copy-inserted into the destination
        and then erased from the source. Now, splice is based on node transfer
        much as merge in key-based indices, and has been similarly extended to
        accept source indices of any type: in fact, splice can be regarded as a
        frontend to the same functionality provided by merge in key-based
        indices. For reasons of backwards compatibility, the destructive
        behavior of splice has been retained in the case that the source and
        destination containers have unequal allocators.
      + The fact has been documented that index iterator types do only depend
        on node_type and the position of the index in its multi_index_container
        , (except for hashed indices, where uniqueness/non-uniqueness is also a
        dependency). This has implications on the validity of iterators to
        elements transferred by merge or splice. This property is a variant of
        what has been called SCARY iterators in the C++ standard mailing lists.
        SCARYness is currently (August 2021) not mandated for standard
        containers.
      + Iterator SCARYness is now also preserved in safe mode.
  * Multiprecision:
      + Rework rational_adaptor to remove dependency on Boost.Rational and
        improve performance.
      + Fix issue with type_traits and clang, see #383.
      + Fixed buggy Lehmer's GCD routine, see #370.
      + Fix mpc_complex constructors so that lossy conversions are explicit,
        see #363.
      + Correct miscellaneous configuration issues (Intel intrinsic usage and
        Apple clang).
      + Correct some iostream operators for unsigned char types.
      + Correct mpq_rational conversions to integer types, see #342.
  * PFR:
      + Added missing #include <memory> for inclusion of std::addressof
      + Fixed -Wzero-length-array warning when dealing with empty aggregates
      + Fixed compilation on msvc compilers <= 1920 (thanks to Alexey Romanov
        aka @alexey-romanov)
      + Added basic CMakeLists.txt support (thanks to @pdimov aka Peter Dimov)
      + Multiple improvements for docs, including links to https://github.com/
        apolukhin/pfr_non_boost
      + Added misc/strip_boost_namespace.sh script to remove boost:: and BOOST_
        prefixes
  * Predef:
      + Version 1.13.1
      + Fix spelling of "epoch".
      + Add missing parenthesis in sparc.h (from tkoecker).
      + Update documentation to use Rouge code styling and Amber general style.
  * Regex:
      + Breaking Change: Change \B to be the opposite of \b as per Perl
        behaviour.
      + Change w32_regex_traits.hpp so that windows.h is no longer included.
      + Fxed fuzzing related issues #151, #152, #153, #156.
  * System:
      + Added support for source locations to error_code.
      + Added error_code::to_string, error_condition::to_string, error_code::
        what.
      + system_error::what() now contains the source location, if present.
      + Added result<T, E = error_code>, a class holding either a value or an
        error, defined in <boost/system/result.hpp>.
  * Utility:
      + Library documentation converted to QuickBook (thanks to Alan de
        Freitas, PR#79).
  * Variant2:
      + Added <boost/variant2.hpp>.
      + Added unsafe_get<I>.
      + Added visit_by_index.
      + Added operator<<.

Updated Tools

  * Build:
      + Includes release of B2 version 4.7.2.
   2021-09-29 18:11:04 by Adam Ciarcinski | Files touched by this commit (14) | Package updated
Log message:
boost: updated to 1.77.0

1.77.0

New Libraries
Describe:
A C++14 reflection library, from Peter Dimov. Provides macros for describing \ 
enumerators and struct/class members, and primitives for querying this \ 
information.
Lambda2:
A C++14, dependency-free, single header lambda library, from Peter Dimov. Allows \ 
simple function objects to be constructed via expressions such as _1 + 5, _1 % 2 \ 
== 0, _1 > _2, or _1 == ' ' || _1 == '\t'.
Updated Libraries
Any:
Added boost::anys::basic_any - a data type with customizable Small Object \ 
Optimization whose instances can hold instances of any type that satisfies \ 
ValueType requirements (many thanks to Ruslan Arutyunyan @rarutyun). If you are \ 
not sure that you really need it, then use boost::any instead.
Started using GithubActions CI for additional testing
Asio:
Added support for cancellation of individual asynchronous operations.
Added the associator trait, used to generically forward associators.
Changed all asynchronous operations implemented in Asio to invoke their \ 
completion handlers as rvalue references.
Added support for asynchronous operations with multiple completion signatures.
Added operator&& and operator|| for awaitable<>, to allow \ 
coroutines to be trivially awaited in parallel.
Added the experimental::as_tuple completion token adapter.
Added the experimental::append completion token adapter.
Added the experimental::prepend completion token adapter.
Added the experimental::deferred completion token, whicih allows deferred \ 
execution of asynchronous operations.
Added the experimental::parallel_group class and \ 
experimental::make_parallel_group function.
Added experimental::promise, which allows eager execution and synchronisation of \ 
asynchronous operations.
Added the experimental::coro class template, a C++20 coroutine primitive with \ 
the ability to combine both asynchronous waiting (co_await) and yielding \ 
(co_yield).
Added move assignment to ssl::stream<>.
Changed co_spawn to dispatch the coroutine's initial step to the executor.
Enabled additional optimisations for any_executor and any_io_executor when used \ 
with asynchronous operations.
Added the nodiscard attribute to awaitable<>.
Increased the number of cached slots in the default recycling allocator.
Changed the default allocator behaviour to respect alignment requirements, to \ 
support over-aligned types.
Ensured the result strings are always initialised in reverse name resolution.
Fixed recursive template instantiation issues in \ 
use_awaitable_t::executor_with_default.
Fixed the any_io_executor equality operators to correctly return a result based \ 
on the target executor.
Fixed strand<> to avoid using a potentially moved-from executor.
Ensured gcc tests are not used for clang when detecting compiler features.
Disabled coroutines support for the clang shipped with MSVC.
Fixed compatibility with recent LibreSSL when OPENSSL_NO_SSL_INTERN is defined.
Fixed posix::basic_stream_descriptor move operations to work with non-defaulted \ 
executors.
Consult the Revision History for further details.
Atomic:
Added make_atomic_ref and make_ipc_atomic_ref factory functions for constructing \ 
atomic reference objects.
Added C++17 template argument deduction guides for atomic_ref and ipc_atomic_ref \ 
to allow omitting template arguments when they can be deduced from constructor \ 
arguments.
Beast:
This maintenance update brings minor bug fixes and updated CI reporting.
We'd love to know how you or your company use Beast, consider adding an entry to \ 
the Companies and Individuals Using Beast list.
See the full Release Notes for a complete list of changes.
Conversion:
boost::implicit_cast is now constexpr.
Fixed broken links.
Started using GithubActions CI for additional testing
Core:
boost/core/uncaught_exceptions.hpp has been modified for compatibility with Mac \ 
OS 10.4 and older.
DLL:
More runtime checks for malformed ELFs in boost::dll::library_info
In boost::dll::library_info use info from .dynsym ELF section if .symtab is \ 
empty or missing
List protected ELF symbols in boost::dll::library_info as they are available for \ 
import
Remove unneeded convert from wchar_t to char on POSIX environment, thanks to \ 
Vladislav Shchapov
Started using GithubAction CI for additional testing
Filesystem:
Introducing Boost.Filesystem v4. This new version of the library removes all \ 
deprecated features of v3 and also makes a number of breaking API changes \ 
intended to make Boost.Filesystem more compatible with std::filesystem \ 
introduced in C++17. The differences are described in the release notes and \ 
documentation using v3 and v4 tags and are also summarised in a separate \ 
section. Users can select Boost.Filesystem version by defining \ 
BOOST_FILESYSTEM_VERSION macro to either 3 or 4 when compiling their code. There \ 
is no need to separately compile Boost.Filesystem for each library version - a \ 
single binary supports both v3 and v4. Users should avoid using both v3 and v4 \ 
in the same application as this can lead to subtle bugs. Currently, v3 is the \ 
default. In a future release v4 will become the default, and eventually v3 will \ 
be removed. v4 is functional, but it is still a work in progress and there may \ 
be breaking API changes in the future.
v4: path::filename, path::stem and path::extension no longer consider root name \ 
or root directory of the path as a filename if the path only consists of those \ 
components. For example, on Windows path("C:").filename() used to \ 
return "C:" and path("C:\\").filename() used to return \ 
"\" and both will return an empty path now.
v4: path::stem and path::extension no longer treat a filename that starts with a \ 
dot and has no other dots as an extension. Filenames starting with a dot are \ 
commonly treated as filenames with an empty extension. The leading dot is used \ 
to indicate a hidden file on most UNIX-like systems.
New: Improved support for various path prefixes on Windows. Added support for \ 
local device prefix ("\\.\") and experimental support for NT path \ 
prefix ("\??\"). The prefixes will be included in the root name of a \ 
path. Note that using the prefixes with Boost.Filesystem v3 can lead to \ 
surprising results (e.g. path("\\\\.\\").stem() == "\\\\"). \ 
It is recommended to use the prefixes only with Boost.Filesystem v4.
Reworked path::lexically_normal implementation to eliminate some cases of \ 
duplicate dot (".") elements in the normalized paths.
New: Added runtime detection of the statx and getrandom system calls on Linux. \ 
This can be useful if the syscall is present at compile time but fails with \ 
ENOSYS at run time (for example, in Docker containers that restrict the syscall, \ 
even if available on the host).
New: Added support for disabling usage of various system APIs at library build \ 
time. This can be useful when a certain API is detected as present by the \ 
library configuration scripts but must not be used for some reason (for example, \ 
when runtime detection does not work on the target system). See the description \ 
of configuration macros in the library documentationfor for more details.
New: Added copy_options::synchronize_data and copy_options::synchronize options \ 
for the copy_file operation. These options allow to synchronize the written data \ 
and attributes with the permanent storage. These options are expensive in terms \ 
of performance, but allow to ensure reliability of the copied data. Note that \ 
copy_file performed implicit data synchronization on POSIX systems since \ 
Boost.Filesystem 1.74.0. This release adds support for more platforms and \ 
disables data synchronization by default while allowing the caller to explicitly \ 
request it.
Added handling of EINTR error code on POSIX systems for some system calls issued \ 
internally. In particular, EINTR could have been ignored on close, which on \ 
HP-UX would result in a leaked file descriptor.
In the copy_file implementations based on Linux sendfile and copy_file_range \ 
system calls, added handling of error codes indicating that a particular \ 
filesystem does not support the system call and fall back to the generic \ 
read/write loop. This should fix copy_file failing on eCryptFS and possibly \ 
other filesystems.
The copy_file_range system call is now used since Linux kernel 4.5, whereas \ 
previously it was only enabled since 5.3. The copy_file implementation will fall \ 
back to sendfile or read/write loop if copy_file_range fails to copy a given \ 
file across filesystems.
The copy_file implementations based on Linux sendfile and copy_file_range system \ 
calls will not be used on filesystems that are known to contain files with \ 
generated content. These system calls are incompatible with such files, and \ 
copying them would result in zero-sized files. The generic read/write loop will \ 
be used instead. Currently, the blacklisted filesystems are: procfs, sysfs, \ 
tracefs and debugfs.
In the copy_file implementation based on read/write loop, increased the maximum \ 
size of the buffer used for temporary storage and take into account the target \ 
filesystem block size for more optimal performance.
On Windows CE, calling current_path to obtain the current path for a process \ 
will now fail with an error instead of returning successfully with a root path. \ 
This platform does not support current directory. Changing the current path was \ 
already failing similarly in previous releases of Boost.Filesystem.
In canonical, fixed the check for a symlink referencing a directory above root, \ 
if an earlier symlink was resolved to an absolute path with a different root \ 
from the original path.
In canonical, added a limit for the maximum number of symlinks that can be \ 
resolved during the call. The limit is currently at least 40 symlinks.
On Windows, canonical and weakly_canonical will now use \ 
path::preferred_separator for the root directory separator in the resulting \ 
paths. This fixes "file not found" errors caused by Windows API not \ 
handling generic separators in UNC paths and paths that start with the Win32 \ 
filesystem prefix ("\\?\").
New: Added weakly_canonical overloads taking base path as an argument.
On Windows, weakly_canonical no longer fails with an error if the input path \ 
contains elements that do not exist in the filesystem but are cancelled by a \ 
subsequent dot-dot ("..") element. For example, \ 
weakly_canonical("C:\\a\\..") would previously fail if \ 
"C:\a" directory did not exist.
In read_symlink on Windows, corrected reparse point handling. The operation \ 
would return an empty path for some mount points (for example, created by Box \ 
cloud storage driver) and directory junction points that had empty print names. \ 
The new implementation now parses substitute name of the reparse point and \ 
attempts to reconstruct a Win32 path from it.
On Windows, file streams provided in boost/filesystem/fstream.hpp will use wide \ 
character paths on libc++ versions 7.0 and higher, when the standard library \ 
supports opening files with wide character paths.
On Windows, creating symlinks should no longer require elevated privileges, if \ 
Windows is configured in Developer mode.
With some compilers, global objects used internally in Boost.Filesystem are now \ 
destroyed after user's global destructors are called. This allows to call \ 
Boost.Filesystem methods during the program termination stage. In particular, \ 
this concerns the path locale that is used for character code conversion and can \ 
be installed by calling path::imbue. The supported compilers include MSVC, GCC \ 
and Clang, as well as other compilers that support customizing program \ 
initialization order through #pragma section (for MSVC-compatible compilers) or \ 
__attribute__ ((init_priority)) (for GCC-compatible compilers).
JSON:
value_to supports TupleLike types.
value_to and value_from support std::array and similar types.
Implicit conversion operator from string to std::string_view.
std::hash specializations for json types.
Fixed allocation errors in object and key_value_pair.
Fixed crash when constructing array from a pair of iterators that form an empty \ 
range.
LexicalCast:
Fixed assignment to an int of a floating point value that is out of \ 
representable range for int.
Started using GithubActions CI for additional testing
Log:
Fixed compilation for riscv32 target.
Mp11:
Added mp_intersperse, mp_split, mp_join
Multi-index Containers:
Maintenance work.
PFR:
A MurMur Hash based implementation of hash_combine() is now used to reduce \ 
collisions count and improve quality of boost::pfr::hash_value()
Visual Studio 2017 now supported in C++14 mode (thanks to Denis Mikhailov aka \ 
@denzor200)
Issues found by inspect tool were fixed
Fixed some warnings, including removal of extra semicolons in \ 
include/boost/pfr/detail/fields_count.hpp
Added a compile time assert for inherited types (thanks to Denis Mikhailov aka \ 
@denzor200)
Reflection of aggregates with non movable fields is now possible if guaranteed \ 
copy elision is on
Fixed spelling issues
Started using GithubActions CI for additional testing
PropertyTree:
This is a maintenance release.
Extend compiler coverage in CI.
Fix Boost compatibility for CMakeLists.txt.
System:
The conversion operator from error_category to std::error_category has been \ 
improved and no longer requires <map> or <mutex>.
The comparison operators of error_category are now inline friends instead of \ 
member functions (a side effect of the previous change.)
error_condition now defers calling generic_category() to avoid instantiating the \ 
object until it's actually needed.
error_condition::failed and error_condition::message have been undeprecated, and \ 
operator bool() now once again returns failed().
The system category now doesn't call generic_category(), to avoid instantiating \ 
the object.
The return value of default_error_condition changes in some cases into an \ 
error_condition from the generic category, instead of from the system category. \ 
This happens on POSIX when the input error_code is from the system category and \ 
does not correspond to any errc_t value.
The interoperability of error_code and std::error_code has been improved \ 
substantially. It is now possible to construct boost::system::error_code from \ 
std::error_code, and it's possible to pass boost::system::error_code to \ 
functions taking std::error_code&.
A stream insertion operator for error_condition has been added.
Uuid:
Added to_chars for writing uuid strings without allocating
   2021-04-22 23:41:52 by Thomas Klausner | Files touched by this commit (1)
Log message:
boost-jam: fix RELRO build

Bump PKGREVISION.
   2021-04-21 14:09:50 by Adam Ciarcinski | Files touched by this commit (13) | Package updated
Log message:
boost: updated to 1.76.0

Updated Libraries

Asio:
Added ip::scope_id_type type alias.
Added ip::port_type type alias.
Added std::hash specialisations for IP addresses.
Added std::hash specialisations for ip::basic_endpoint<>.
Refactored SFINAE usage to improve compile times.
Added friendship support to customisation points, and made most customisations \ 
private.
Changed any_io_executor to a "strong typedef"-style class.
Fixed experimental::as_single to work with handler hook deprecation.
Ensured pthread condition variable attributes are cleaned up on all platforms.
Clarified thread safety notes on sockets and descriptors.
Ensured errno is not overwritten if socket() fails on macOS/FreeBSD.
Fixed work tracking for io_context and thread_pool executors when move-assigned.
Ensured internal call_stack objects are accessed only from implementation files.
Fixed I/O object move-assignment to ensure the executor is left in a valid state.
Fixed detection of compiler support for defaulted template argument on functions \ 
with MSVC.
Prevented the blocking.always property from being used with strand<>, as \ 
it did not produce the correct semantics.
Removed deprecated file asio/impl/src.cpp.
Atomic:
Fixed compilation with MSVC for ARM.

Beast:
This update brings minor bug fixes and revamped CI reporting.
We'd love to know how you or your company use Beast, consider adding an entry to \ 
the Companies and Individuals Using Beast list.
See the full Release Notes for a complete list of changes.

Bind:
Add support for using the standard C++11 placeholders with boost::bind.
Update boost::apply to use variadic templates and perfect forwarding.
Container:
Added [[no-discard]] attribute in all containers to catch bugs related to unused \ 
return values.
Replaced default standard exception classes with Boost.Container own classes, \ 
reducing considerably the included files overhead. Example: in MSVC 19 \ 
boost/container/vector.hpp preprocessed file size reduces from 1,5MB to 930KB. \ 
If you still want to use standard exception classes, you can define \ 
BOOST_CONTAINER_USE_STD_EXCEPTIONS before using any Boost.Container class.
Fixed bugs/issues:
GitHub 102: "flat_map::insert ambiguous with initializer list & pairs \ 
that need to convert".
GitHub 139: "flat_map merge and iterators".
GitHub 141: "small_vector does not propagate no throw properties of move \ 
operation of contained type".
GitHub 164: "Compile error when using pmr::map with a std::pair; works when \ 
using a std::tuple".
GitHub 171: "deque::clear() uses undefined behaviour".

Core:
Add implicit conversion between compatible reference wrappers.
Add boost/core/cmath.hpp, a portable implementation of the floating point \ 
classification functions from <cmath>.
Add boost/core/bit.hpp, a portable implementation of the C++20 standard header \ 
<bit>.
Fix BOOST_TEST_EQ, BOOST_TEST_NE for character types under C++20.
Revise allocator access utilities (now support VS2013, and no workarounds use \ 
allocator_traits.)

DLL:
BREAKING CHANGE: boost::dll::import was renamed to boost::dll::import_symbol to \ 
avoid collision with C++20 import keyword.
Updated docs, including FAQ section.

Filesystem:
Updated compatibility with WASI platform.
Fixed an exception being thrown by path::remove_filename if the path is \ 
"////".
Fixed create_directories disregarding errors from file status query operations \ 
issued internally. This could result in incorrect error codes returned by \ 
create_directories.
GIL:
BREAKING: In next release, we are going to drop support for GCC 5. We will also \ 
change the required minimum C++ version from C++11 to C++14.

Intrusive:
Reduced compile-time dependencies:
linear_slist_algorithms use a simple node_ptr instead of std::pair on return.
list/slist use operator </operator == instead of std::equal_to/std::less.
Fixed GitHub 54: set.rbegin() looks like O(log(N))

Interprocess:
Added wchar_t API support for named resources in operating systems that offer \ 
native wide character API (e.g. Windows). The following classes were updated \ 
with wchar_t name support:
file_mapping
managed_mapped_file
managed_shared_memory
managed_windows_shared_memory
shared_memory_object
windows_shared_memory_object
file_lock
named_condition
named_condition_any
named_mutex
named_recursive_mutex
named_semaphore
named_sharable_mutex
named_upgradable_mutex
message_queue
Added BOOST_INTERPROCESS_FORCE_NATIVE_EMULATION macro option to disable the use \ 
of generic emulation code for process shared synchronization primitives instead \ 
of native POSIX or Winapi functions.
Fixed bugs:
GitHub 76 ("Cygwin compilation errors").
GitHub 83 ("Add BOOST_INTERPROCESS_FORCE_NATIVE_EMULATION option").
GitHub 92 ("bufferstream: Correct MSVC compilation warning").
GitHub 106 ("Use fallocate on truncate_file").
GitHub 120 ("segment_manager customization").
GitHub 122 ("Mark constructors/assignment/swap noexcept where possible").
GitHub 126 ("_ReadWriteBarrier is deprecated warning when compiling with \ 
clang-cl.exe").

JSON:
Security Report from Bishop Fox.
Refactored value_from implementation; user customizations are now always \ 
preferred over library-provided overloads.
Fix imprecise parsing for some floating point numbers.
Fix link errors in standalone mode, when used alongside Boost.
Fix Boost.Build builds on GCC 4.8.

LexicalCast:
Dropped dependency on Boost.Math
Fixes for the CI and coverage
Log:
Bug fixes:
Corrected a formal race condition in the thread-safe log record queue \ 
implementation used in the unbounded_fifo_queue policy of the asynchronous_sink \ 
frontend. The race could be detected by TSAN, but it was not a real problem on \ 
most current CPU architectures and compilers.
When copying a logger with a channel attribute (e.g. channel_logger), the \ 
channel attribute is now deep-copied from the original logger. This means that \ 
modifying the channel in the new logger will no longer affect the original \ 
logger.
Replaced the use of std::allocator<void> in template parameters with a new \ 
tag type boost::log::use_std_allocator to silence libc++ warnings about the \ 
former being deprecated in C++17 and later. The tag indicates that the \ 
instantiated template should be using a specialization of std::allocator \ 
internally to allocate dynamic memory, so the change has no functional effect.
Boost.Log no longer defines __MSVCRT_VERSION__ macro on MinGW and MinGW-w64. \ 
Defining this macro caused incompatibility with UCRT, which is available as an \ 
option in recent MinGW-w64.
See changelog for more details.

Math:
Breaking Change: C++03 support is now removed, a C++11 or later conformant \ 
compiler is now required to use this library.
Added Z-test.
Added execution policy support to univariate and bivariate statistics: enables \ 
parallel execution (requires C++17 and <execution>).
Big update/improvement on CI testing.
Bivariate statistics now have integer support.
T-Test now has integer support.
Linear regression now has integer support.
Correct PDF of the beta distribution at the endpoints.
Correct use of Stirling's approximation in certain multiprecision cases.
Eliminate -Wimplicit-int-float-conversion on clang.
Fix some constexpr issues in quaternion/octonion.
Minor performance fix to tanh_sinh integration.
Update hypergeometric functions internal scaling to allow for 64-bit (long long) \ 
exponents with multiprecision types.

Move:
Git Issue 35: "New nothrow move traits are incomplete".

Multiprecision:
BREAKING CHANGE: Massive refactoring and code simplification makes C++11 an \ 
absolute requirement.
Use BOOST_TRY/CATCH in headers so code can be used in exception-free environments.
Correct corner case in pow.
Correct exception type thrown to match docs in lsb/msb.
Allow moves and operators between related but different types (ie types with the \ 
same allocator).

Nowide:
Fix discarding of characters for text file streams when seek or sync functions \ 
are used and newlines were converted (e.g. on Windows)
Fix potential use-after-free bug when reusing (via open) a file stream that has \ 
been closed
Fix potential invalid memory access when using a file stream that has been moved \ 
or swapped to where the source had a put-back character or was set to unbuffered \ 
mode
Fix compatibility with ucrt runtime by not defining __MSVCRT_VERSION__
Known issues: Read performance for text files is degraded. Binary files and \ 
writing is unaffected.

Optional:
Fixed MSVC warning C4702.

Outcome:
Announcements:
BREAKING CHANGE: After a year and three major Boost releases announcing this \ 
upcoming change, this is the FIRST RELEASE of the v2.2 branch. This branch has a \ 
number of major breaking changes to the Outcome v2.1 which shipped in Boost 1.75 \ 
and earlier, see the documentation for details.
Enhancements:
VS2019.8 changed how to enable Coroutines, which caused Outcome to not compile \ 
on that compiler.
If on C++ 20, we now use C++ 20 [[likely]] instead of compiler-specific markup \ 
to indicate when TRY has likely success or failure.
BREAKING CHANGE: Previously the value of spare_storage(const \ 
basic_result|basic_outcome *) noexcept was not propagated over \ 
BOOST_OUTCOME_TRY, which causes things like stack backtraces captured at the \ 
point of construction of an errored result to get dropped at every TRY point. \ 
This has been fixed by adding an optional spare_storage to success_type<T> \ 
and failure_type<T>, as well as to auto success(T &&, ...) and \ 
auto failure(T &&, ...).
Bug fixes:
Boost.Outcome should now compile with BOOST_NO_EXCEPTIONS defined. Thanks to \ 
Emil, maintainer of Boost.Exception, making a change for me, Boost.Outcome \ 
should now compile with C++ exceptions globally disabled. You won't be able to \ 
use boost::exception_ptr as it can't be included if C++ exceptions are globally \ 
disabled.
BREAKING CHANGE 244 It came as a shock to learn that BOOST_OUTCOME_TRY had been \ 
broken since the inception of this library for certain corner case code, which \ 
required a breaking change in how TRY works. See the changelog in the \ 
documentation for more detail.

Parameter:
Added a workaround for MSVC 2015 code miscompilation when an rvalue was used as \ 
a default value of a named parameter of a function.

PFR:
Fixed reflection of types with missing const in SFINAE expressions in template \ 
constructor. Now reflection of aggregates with \ 
std::optional<std::chrono::duration<???>> fields works on any \ 
Standard Library implementation, even if LWG3050 is not fixed.
Comparison functions are now constexpr
Fixed numerous typos in docs

PolyCollection:
Worked around GCC bug affecting GCC versions 9.3-10.2.

Predef:
Version 1.13
Add ARCH_PPC_64 predef.
Fix ARCH_WORD_BITS* redefinition warnings/errors.
Add ARCH_E2K, Elbrus 2000, architecture from Konstantin Ivlev.
Fix not handling recent C++ version that go above 10.x version.
Version 1.12
Switch to using the endian.h header on OpenBSD. (Brad Smith)
Fix not handling recent versions of stdcxx that go above version 9.
Fix including sub-BSD OS headers directly causing redef warnings.
Add CI testing of direct inclusion of all headers.
Add CI testing on FreeBSD for clang and gcc.
Add WORD_BITS set of predefs to detect the architecture word size. Initial \ 
implementation inspired by submission from Mikhail Komarov.
Add CI testing for Cygwin 32 and 64.

PropertyTree:
Property Tree has a new maintainer.
Fix usage of deprecated Boost.Bind features.
Link to Wikipedia fixed.
Use BOOST_OVERRIDE to fix GCC warnings.
Add extensive CI testing.

Regex:
Regex is now header only except in C++03 mode.
Support for C++03 is now deprecated.
The library can now be used "standalone" without the rest of Boost \ 
being present.

Stacktrace:
Better support for pre-C++11 builds on clang.
Bigger warning for do not use boost::stacktrace::stacktrace in signal handlers.

TypeTraits:
Fix for Visual Studio managed code projects.

Variant2:
Improved generated code for the double buffered case.

Updated Tools
Build:
Includes release of B2 version 4.4.1.
   2021-01-01 09:19:02 by Ryo ONODERA | Files touched by this commit (22) | Package updated
Log message:
boost: Update to 1.75.0

Changelog:
1.75.0
New Libraries

  * JSON: JSON parsing, serialization, and DOM in C++11, from Vinnie Falco and
    Krystian Stasiowski.
      + Fast compilation requiring only C++11
      + Easy and safe modern API with allocator support
      + Compile without Boost, define BOOST_JSON_STANDALONE
      + Optional header-only, without linking to a library
  * LEAF: A lightweight error-handling library for C++11, from Emil Dotchevski.
      + Small single-header format, no dependencies.
      + Designed for maximum efficiency ("happy" path and \ 
"sad" path).
      + No dynamic memory allocations, even with heavy payloads.
      + O(1) transport of arbitrary error types (independent of call stack
        depth).
      + Can be used with or without exception handling.
  * PFR: Basic reflection without macro or boilerplate code for user defined
    types, from Antony Polukhin.

Updated Libraries

  * Asio:
      + Enabled support for UNIX domain sockets on Windows.
      + Added executor-converting construction and assignment to ip::
        basic_resolver.
      + Added compatibility between polymorphic executors and the (deprecated)
        handler invocation hook.
      + Added the experimental::as_single completion token adapter.
      + Added support for MSG_NOSIGNAL on more platforms by using
        _POSIX_VERSION to detect whether it is supported.
      + Added the ability to compile using libpthread on Windows.
      + Added workarounds for the Intel C++ compiler.
      + Added more support for detecting and optimising for handlers that have
        no custom executor.
      + Reduced lock contention for timer cancellation on Windows.
      + Reinstated a previously removed null-pointer check, as it had a
        measurable impact on performance.
      + Fixed the executor concept to test for a const-qualified execute().
      + Fixed any_executor support for builds without RTTI support.
      + Fixed the thread_pool unit test to work without RTTI support.
      + Fixed C++20 coroutines compatibility with clang on Windows.
      + Fixed some compatibility issues with Windows Runtime.
      + Fixed shadow name warnings caused by addition of asio::query.
      + Fixed a "logical ‘or’ of equal expressions" warning on linux.
      + Fixed a benign switch fallthrough warning.
      + Added missing push/pop_options.hpp includes.
      + Suppressed zero-as-null-pointer-constant warnings.
      + Fixed a comma-operator warning.
      + Updated the documentation to clarify when the select reactor is used on
        Windows.
      + Fixed potential ambiguity caused by any_executor comparisons and
        conversion.
      + Added detection of non-experimental C++20 coroutines on MSVC 19.8.
      + Fixed compatibility with uClibc.
      + Fixed strand<> adaptation of Networking TS executors when targeting
        older C++ versions or less conformant compilers.
      + Consult the Revision History for further details.
  * Atomic:
      + Implemented SSE2 and SSE4.1 versions of address lookup algorithm, which
        is used in the internal lock pool implementation. This may improve
        performance of waiting and notifying operations in heavily contended
        cases.
      + Fixed a possible compilation error on AArch64 targets caused by
        incorrect instructions generated for bitwise (logical) operations with
        immediate constants. (#41)
  * Beast:
      + This update brings bug fixes and support for the
        BOOST_ASIO_ENBALE_HANDLER_TRACKING compile flag from Boost.Asio:
      + We'd love to know how you or your company use Beast, consider adding an
        entry to the Companies and Individuals Using Beast list.
      + See the full Release Notes for a complete list of changes.
  * Container:
      + New devector container.
      + Fixed bugs/issues:
          o #152 Tree-based containers have troubles with move-only types.
          o #156 Compile error with vector.
          o PR#157 Add missing include.
          o #159: pmr::monotonic_buffer_resource crashes on large single
            allocations.
          o #160: Usage of uses_allocator needs a remove_cvref_t.
          o #162: small_vector on MSVC x86 call-by-value crash.
          o #161: polymorphic_allocator(memory_resource*) non-standard
            extension causes headache.
          o PR#163: container_rebind for small_vector with options.
          o #165: Link error with shared library and memory_resource inline
            members.
          o PR#166: Fix encoding error in copyright headers.
          o PR#167: error: the address of 'msg' will always evaluate as 'true'
            warning with GCC 4.4.
          o #169: flood of warnings building dlmalloc_ext_2_8_6.c on clang11.
  * Endian:
      + endian_arithmetic no longer inherits from endian_buffer
      + When BOOST_ENDIAN_NO_CTORS is defined, the unaligned endian_buffer and
        endian_arithmetic are C++03 PODs, to enable use of __attribute__((
        packed))
  * Filesystem:
      + New: Added creation_time operation, which allows to obtain file
        creation time. (Inspired by PR#134)
      + The returned value of last_write_time(p, ec) operation in case of
        failure has been changed to a minimal value representable by std::
        time_t instead of -1.
      + The returned value of hard_link_count(p, ec) operation in case of
        failure has been changed to static_cast<uintmax_t>(-1) instead of 0.
      + On POSIX systems, file_size will now indicate error code errc::
        function_not_supported if the path resolves to a non-regular file.
        Previously, errc::operation_not_permitted was reported.
      + On Linux, many operations now use statx system call internally, when
        possible, which allows to reduce the amount of information queried from
        the filesystem and potentially improve performance. The statx system
        call was introduced in Linux kernel 4.11.
      + Removed const-qualification from return types of some path methods.
        This could prevent move construction and move assignment at the call
        site in some cases. (#160)
      + On OpenBSD 4.4 and newer, use statvfs system call to obtain filesystem
        space information. (Inspired by PR#162)
      + On Windows, space now returns with an error if the provided path does
        not idendify an existing file. (#167)
  * GIL:
      + BREAKING: In next release, we are going to drop support for GCC 5. We
        may also change the required minimum C++ version from C++11 to C++14.
  * Histogram:
      + This update brings
          o Bug-fixes for corner-cases
          o Small documentation improvements
          o Fixes for new warnings from latest compilers and when compiling
            against the C++20 standard
      + See the full Release Notes for a complete list of changes.
  * Interprocess:
      + Fixed bugs:
          o #127: static assertion failure with boost interprocess 1.74 and
            basic_managed_shared_memory.
  * Intrusive:
      + Fixed bugs:
          o PR#48: MSVC "assignment within conditional" warning fix.
          o PR#49: Fix empty control statement warnings.
          o #52: Invalid casting in BOOST_INTRUSIVE_BSR_INTRINSIC.
  * Log:
      + Bug fixes:
          o Corrected the file counter that would be used in text_file_backend
            when generating the target file name (based on the pattern set by
            set_target_file_name_pattern method) when the log file is rotated.
            (#125)
          o Replaced a volatile version counter in basic_sink_frontend with an
            atomic. (#128)
          o In the asynchronous_sink frontend, resolved a possible conflict
            between flush and run methods, if run is called from a user's
            thread instead of the internal dedicated thread spawned by the
            frontend. (#131)
      + See changelog for more details.
  * Move:
      + Fixed bugs:
          o #30: (void) C-cast is a non-portable way of suppressing compiler
            warnings.
  * Mp11:
      + Added mp_pairwise_fold (suggested by Barry Revzin)
      + Removed mp_invoke (use mp_invoke_q)
  * Optional:
      + boost::none is constexpr-declared.
      + Fixed issue #78.
  * Outcome:
      + Announcements:
          o After a year and three major Boost releases announcing this
            upcoming change, this is the FINAL RELEASE of the v2.1 branch. From
            Boost 1.76 onwards, the v2.2 branch becomes the default. This
            branch has a number of major breaking changes to Outcome v2.1, see
            the documentation for details.
      + Enhancements:
          o The ADL discovered event hooks have been replaced with
            policy-specified event hooks instead. This is due to brittleness
            (where hooks would quietly self-disable if somebody changed
            something), compiler bugs (a difference in compiler settings causes
            the wrong hooks, or some but not all hooks, to get discovered), and
            end user difficulty in using them at all. The policy-specified
            event hooks can be told to default to ADL discovered hooks for
            backwards compatibility: set OUTCOME_ENABLE_LEGACY_SUPPORT_FOR to
            less than 220 to enable emulation.
          o Improve configuring OUTCOME_GCC6_CONCEPT_BOOL. Older GCCs had
            boolean based concepts syntax, whereas newer GCCs are standards
            conforming. However the precise logic of when to use legacy and
            conforming syntax was not well understood, which caused Outcome to
            fail to compile depending on what options you pass to GCC. The new
            logic always uses the legacy syntax if on GCC 8 or older, otherwise
            we use conforming syntax if and only if GCC is in C++ 20 mode or
            later. This hopefully will resolve the corner case build failures
            on GCC.
      + Bug fixes:
          o Boost.Outcome should now compile with BOOST_NO_EXCEPTIONS defined.
            Thanks to Emil, maintainer of Boost.Exception, making a change for
            me, Boost.Outcome should now compile with C++ exceptions globally
            disabled. You won't be able to use boost::exception_ptr as it can't
            be included if C++ exceptions are globally disabled.
          o #236 In the Coroutine support the final_suspend() was not noexcept,
            despite being required to be so in the C++ 20 standard. This has
            been fixed, but only if your compiler implements noop_coroutine.
            Additionally, if noop_coroutine is available, we use the much more
            efficient coroutine handle returning variant of await_suspend()
            which should significantly improve codegen and context switching
            performance.
  * Polygon:
      + C++20 fixes for event_comparison_type, vertex_equality_predicate_type,
        and voronoi_predicates. (Glen Fernandes)
  * Preprocessor:
      + When variadic data is empty in C++20 mode with __VA_OPT__ support the
        variadic size has been corrected to be 0. This also means that in this
        C++20 mode it is now valid to convert to and from empty arrays and
        lists and variadic data. The end-user can read the "C++20 Support For
        Variadic Macros" part of the "variadic macros" topic for more
        information about empty variadic data in the library.
      + The macro BOOST_PP_IS_STANDARD() has been added for identifying if the
        currently used preprocessor is a C++ standard conforming preprocessor.
        A number of preprocessors which generally work correctly with the
        library but need various internal workarounds, including the currently
        default VC++ preprocessor, are not considered C++ standard conforming
        preprocessors. However most preprocessors, including among others gcc,
        clang, and the new but currently non-default VC++ preprocessor in
        VS2019, are C++ standard conforming preprocessors.
      + For C++ standard conforming preprocessors a number of the limits
        defined in the config/limits.hpp can now be changed to higher amounts
        for a TU. The end-user should read the "limitations" topic to
        understand how and which limits can be changed.
      + For C++ standard conforming preprocessors, in order to allow the
        maximum number of FOR and WHILE iterations, the beginning 'r' and 'd'
        iteration numbers in the user-defined macros start at 1 and not 2, as
        it did in previous releases. This could be a breaking change if these
        iteration numbers are used in the user-defined macros ( they probably
        would not be ), but the change was necessary to fix some arcane bugs
        when dealing with numerical/logical operations with maximum numbers as
        well to allow the user-defined macros to be called the correct possible
        maximum number of times. For non-C++ conforming preprocessors, this
        change was not made because those non-conforming C++ preprocessors
        generally have limitations which disallow the maximum number of looping
        constructs to be run, and it was felt not to introduce a possible
        breaking change to those more fragile preprocessors would be better. It
        was also felt that besides fixing some arcane preprocessor bugs and
        providing the possible maximum number of user-defined macro
        invocations, this change could be made because it has never been
        documented what the starting 'r' and 'd' iteration numbers actually are
        but only that these numbers are incremented for each iteration.
      + The library has been upgraded to assume variadic macro support for any
        compiler working with the library. Ostensibly this means that the
        library is now a C++11 on up library, yet most of the major compilers,
        including gcc, clang, and VC++, also support variadic macros in C++98/
        C++03 mode as long as strict compliance to C++98/C++03 is not turned on
        when using one of those compilers.
  * Rational:
      + Fix Rational operators to not break under new C++20 operator==
        rewriting rules. (Glen Fernandes)
  * Signals2:
      + Correct C++ allocator model support to fix compilation in C++20
        standards mode. (Glen Fernandes)
  * System:
      + The platform-specific headers windows_error.hpp, linux_error.hpp, and
        cygwin_error.hpp emit deprecation messages and are slated for removal.
      + The old names for generic_category() and system_category() emit
        deprecation messages and are slated for removal.
      + error_condition::failed is deprecated and is slated for removal.
        operator bool() for error_condition has been reverted to its old
        meaning of value() != 0. This is done for compatibility with std::
        error_condition as the next release is expected to improve
        interoperability with <system_error> even further. Note that this does
        not affect error_code::failed, which is still alive and well.
      + The overload of error_condition::message that takes a buffer is
        deprecated and is slated for removal, for the same reasons. Note that
        this does not affect error_code::message.
  * uBLAS:
      + Correct C++ allocator model support to fix compilation in C++20
        standards mode. (Glen Fernandes and Conrad Poelman)
  * VMD:
      + The VMD number parsing has been upgraded to support the ability for the
        end-user to change the number limits in the Preprocessor library.
      + The macro BOOST_VMD_IS_GENERAL_IDENTIFIER has been added to support the
        parsing of input that represents a preprocessor token which matches the
        VMD identifier syntax, without having to register the identifier as a
        specific identifier.
  * Wave:
      + Added new C++20 tokens, including the spaceship operator <=>
      + Fixed bugs:
          o #94: fix incorrect behavior of __LINE__ and __FILE__ under
            rescanning

1.74.0
New Libraries

  * STLInterfaces: A library of CRTP bases to ease the writing of STL views,
    iterators, and sequence containers, from Zach Laine.

Updated Libraries

  * Asio:
      + Added an implementation of the proposed standard executors (P0443r13,
        P1348r0, and P1393r0).
      + Added support for the proposed standard executors to Asio's I/O
        facilities.
          o The supplied executors now meet the requirements for the proposed
            standard executors. These classes also continue to meet the
            existing requirements for the Networking TS model of executors.
          o All I/O objects, asynchronous operations, and utilities will
            interoperate with both new proposed standard executors, and with
            existing Networking TS executors.
          o The any_io_executor type alias has been introduced as the default
            runtime-polymorphic executor for all I/O objects. This defaults to
            the execution::any_executor<> template. If required for backward
            compatibility, BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT can be defined
            to use the old asio::executor polymorphic wrapper instead.
          o Support for the existing Networking TS model of executors can be
            disabled by defining BOOST_ASIO_NO_TS_EXECUTORS.
      + Added converting move construction and assignment to
        basic_waitable_timer.
      + Enabled C++20 coroutine support when using gcc 10.
      + Added overloads of co_spawn that launch an awaitable.
      + Added a new constructor overload to use_awaitable_t's default executor
        adapter, to enable conversion between executor types.
      + Added support for using detached_t as a default completion token, by
        adding members as_default_on() and as_default_on_t<>.
      + Added a move constructor to ssl::stream<>.
      + Changed ssl::stream<> write operations to linearise gather-write buffer
        sequences.
      + Added compile-time detection of the deprecated asio_handler_invoke,
        asio_handler_allocate, and asio_handler_deallocate hooks, when
        BOOST_ASIO_NO_DEPRECATED is defined.
      + Implemented a number of performance optimisations.
      + Added source location support to handler tracking.
      + Implemented various improvements to the handlerviz.pl tool.
      + Added the handlerlive.pl tool, which processes handler tracking output
        to produce a list of "live" handlers.
      + Added the handlertree.pl tool, which filters handler tracking output to
        include only those events in the tree that produced the nominated
        handlers.
      + Added changes for clang-based Embarcadero C++ compilers.
      + Fixed a deadlock that can occur when multiple threads concurrently
        initialise the Windows I/O completion port backend.
      + Fixed async_compose to work with copyable handlers when passed by
        lvalue.
      + Fixed completion signature deduction in co_spawn.
      + Removed a spurious Executor base class from the executor_binder
        implementation.
      + Various fixes and improvements in the documentation and examples.
      + Consult the Revision History for further details.
  * Atomic:
      + Added missing const qualifiers to some operations in atomic_ref.
      + Added support for yield instruction on ARMv8-A. The instruction is used
        internally in spin loops to reduce CPU power consumption.
      + Added support for C++20 waiting and notifying operations. The
        implementation includes generic backend that involves the internal lock
        pool, as well as specialized backends for Windows, Linux, FreeBSD,
        DragonFly BSD and NetBSD. Atomic types provide a new method
        has_native_wait_notify, a static boolean constant
        always_has_native_wait_notify and a set of capability macros that allow
        to detect if the implementation supports native waiting and notifying
        operations for a given type.
      + Changed internal representation of atomic_flag to use 32-bit storage.
        This allows for more efficient waiting and notifying operations on
        atomic_flag on some platforms.
      + Added support for build-time configuration of the internal lock pool
        size. The user can define the BOOST_ATOMIC_LOCK_POOL_SIZE_LOG2 macro to
        specify binary logarithm of the size of the lock pool. The default
        value is 8, meaning that the size of the lock pool is 256, up from 64
        used in the previous release.
      + Added support for a new set of atomic types dedicated for inter-process
        communication: ipc_atomic_flag, ipc_atomic and ipc_atomic_ref. Users
        are recommended to port their code using non-IPC types for
        inter-process communication to the new types. The new types provide the
        same set of operations as their non-IPC counterparts, with the
        following differences:
          o Most operations have an added precondition that is_lock_free
            returns true for the given atomic object. The library will issue a
            compile time error if this precondition is known to be not
            satisfied at compile time.
          o All provided operations are address-free, meaning that the atomic
            object (in case of ipc_atomic_ref - the referenced object) may be
            located in process-shared memory or mapped into the same process at
            multiple different addresses.
          o The new has_native_wait_notify operation and
            always_has_native_wait_notify constant indicate support for native
            inter-process waiting and notifying operations. When that support
            is not present, the operations are implemented with a busy loop,
            which is less efficient, but still is address-free. A separate set
            of capability macros is also provided to indicate this support.
      + Added new atomic_unsigned_lock_free and atomic_signed_lock_free types
        introduced in C++20. The types indicate the atomic object type for an
        unsigned or signed integer, respectively, that is lock-free and
        preferably has native support for waiting and notifying operations.
      + Added new gcc assembler backends for ARMv8-A (for both AArch32 and
        AArch64). The new backends are used to implement operations not
        supported by compiler intrinsics (including 128-bit operations on
        AArch64) and can also be used when compiler intrinsics are not
        available. Both little and big endian targets are supported. AArch64
        backend supports extensions defined in ARMv8.1 and ARMv8.3.
      + Added support for big endian targets in the legacy ARM backend based on
        gcc assembler blocks (this backend is used on ARMv7 and older targets).
        Previously, the backend assumed little endian memory layout, which is
        significant for 64-bit operations.
      + Improved performance of seq_cst stores and thread fences on x86 by
        using lock-prefixed instructions instead of mfence. This means that the
        operations no longer affect non-temporal stores, which was also not
        guaranteed before. Use specialized instructions and intrinsics to order
        non-temporal memory accesses.
      + Fixed capability macros for 80-bit long double on x86 targets not
        indicating lock-free operations even if 128-bit atomic operations were
        available.
      + Fixed compilation of gcc asm blocks on Alpha targets.
      + In the gcc __sync* intrinsics backend, fixed that store and load
        operations of large objects (larger than a pointer size) could be
        non-atomic. The implementation currently assumes that small objects can
        be stored with a single instruction atomically on all modern
        architectures.
  * Beast:
      + This update brings bug fixes and support for the following changes
        changes in Boost.Asio:
      + Beast supports BOOST_ASIO_NO_DEPRECATED. Define this to help identify
        areas of your Beast and Asio code which use deprecated Asio interfaces.
      + Beast also supports BOOST_ASIO_NO_TS_EXECUTORS. Define this to identify
        uses of executors from the now potentially outdated Networking TS
      + Asio will use the Standard Executors model by default. You can prevent
        this behaviour by defining BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT in
        which the Networking TS model will be used by default. Setting this
        flag does not prevent a program from using executors from the Standard
        Executors model explicitly.
      + We'd love to know how you or your company use Beast, consider adding an
        entry to the Companies and Individuals Using Beast list.
      + See the full Release Notes for a complete list of changes.
  * Bimap:
      + Correct allocator usage (fixes C++20 compilation). (Glen Fernandes)
  * Config:
      + Implement BOOST_NO_CXX11_OVERRIDE and BOOST_OVERRIDE. (Glen Fernandes)
  * Core:
      + Implemented the allocator access utilities which provide a replacement
        for allocator_traits with individual traits and functions for each
        facility. They support the C++11 allocator model when possible and
        provide a fallback for C++98 compatibility. These are now used in
        Circular_Buffer, Wave, Lockfree, Heap, Smart_Ptr, Dynamic_Bitset,
        Format, Bimap and more. (Glen Fernandes)
  * DLL:
      + Multiple fixes for the library_info work on empty shared objects.
      + Compilation fixes for C++98 and C++11 modes (#28).
      + Fixes for smart_library manglings (thanks to XiaLiChao82 #37).
  * Endian:
      + Enabled scoped enumeration types in endian_reverse.
      + Enabled bool, enum, float, double in endian_reverse_inplace.
      + Added an overload of endian_reverse_inplace for arrays.
  * Filesystem:
      + Removed compile-time checks for support for symlinks and hardlink on
        Windows. Instead, a runtime check is used. (PR#142)
      + Fixed handling of reparse points in canonical and read_symlink on
        Windows. This also affects other algorithms that involve canonical and
        read_symlink in their implementation. (PR#100, #85, #99, #123, #125)
      + Fixed that read_symlink on Windows could potentially fail or cause
        failures elsewhere with a sharing violation error, if the same symlink
        was opened concurrently. (#138)
      + Fixed that is_symlink(directory_entry) would always return false, even
        if the directory entry actually referred to a symlink. (PR#148)
      + Added missing status inspection operation overloads for directory_entry
        and error_code (e.g. is_directory(directory_entry, error_code&)).
        Removed incorrect noexcept specifications for the overloads not taking
        the error_code arguments.
      + copy_file implementation has been updated to perform checks on the
        source and target files, as required by C++20 ([fs.op.copy.file]/4.1).
        In particular, the operation will fail if the source or target file is
        not a regular file or the source and target paths identify the same
        file.
      + copy_file on POSIX systems will now also copy the source file
        permissions to the target file, if the target file is overwritten.
      + New: Added copy_file implementations based on sendfile and
        copy_file_range system calls on Linux, which may improve file copying
        performance, especially on network filesystems.
      + Deprecated: The copy_option enumeration that is used with the copy_file
        operation is deprecated. As a replacement, the new enum copy_options
        (note the trailing 's') has been added. The new enum contains values
        similar to the copy_options enum from C++20. The old enum values are
        mapped onto the new enum. The old enum will be removed in a future
        release.
      + New: Added copy_options::skip_existing option, which allows copy_file
        operation to succeed without overwriting the target file, if it exists.
      + New: Added copy_options::update_existing option, which allows copy_file
        operation to conditionally overwrite the target file, if it exists, if
        its last write time is older than that of the replacement file.
      + New: copy_file now returns bool, which indicates whether the file was
        copied.
      + New, breaking change: copy operation has been extended and reworked to
        implement behavior specified in C++20 [fs.op.copy]. This includes
        support for copy_options::recursive, copy_options::copy_symlinks,
        copy_options::skip_symlinks, copy_options::directories_only,
        copy_options::create_symlinks and copy_options::create_hard_links
        options. The operation performs additional checks based on the
        specified options. Applying copy to a directory with default
        copy_options will now also copy files residing in that directory (but
        not nested directories or files in those directories).
      + New: Added create_directory overload taking two paths. The second path
        is a path to an existing directory, which is used as a source of
        permission attributes to use in the directory to create.
      + Deprecated: copy_directory operation has been deprecated in favor of
        the new create_directory overload. Note that the two operations have
        reversed order of the path arguments.
      + equivalent on POSIX systems now returns the actual error code from the
        OS if one of the paths does not resolve to a file. Previously the
        function would return an error code of 1. (#141)
      + equivalent no longer considers file size and last modification time in
        order to test whether the two paths refer to the same file. These
        checks could result in a false negative if the file was modified during
        the equivalent call.
      + New: Added absolute overloads taking error_code argument.
      + Operations that have current_path() as the default value of their
        arguments and also have an error_code argument will use the
        current_path(error_code& ec) overload to obtain the current path, so
        that its failure is reported via the error_code argument instead of an
        exception.
      + space now initializes the space_info structure members to -1 values on
        error, as required by C++20 ([fs.op.space]/1).
      + space on Windows now accepts paths referring to arbitrary files, not
        only directories. This is similar to POSIX systems and corresponds to
        the operation description in C++20. (#73)
      + New: Added implementation of temp_directory_path for Windows CE. (PR#25
        )
      + New: Improved compatibility with WASI platform. (PR#144)
      + New: Improved support for Embarcadero compilers. (PR#130)
      + New: Added implementations of unique_path operation based on getrandom
        (Linux), arc4random_buf (OpenBSD/FreeBSD/CloudABI) and BCrypt (Windows)
        system APIs.
      + Deprecated: Auto-linking against system libraries on Windows with
        MSVC-compatible compilers is deprecated and will be removed in a future
        release. This affects users linking against static library of
        Boost.Filesystem. Users are advised to update their project build
        systems to either use a shared library of Boost.Filesystem, or
        explicitly specify the dependencies of Boost.Filesystem in the linker
        command line. Users of shared library of Boost.Filesystem are not
        affected.
  * Flyweight:
      + Maintenance work.
  * Format:
      + Correct allocator usage (fixes C++20 compilation). (Glen Fernandes)
  * Geometry:
      + Improvements
          o PR#720 Additional R-tree constructors (thanks to Caian Benedicto).
          o Various improvements in buffer, set and relational operations.
      + Solved issues
          o #709 memcpy called for object with no trivial copy-assignment.
          o #721 Compilation error in bgi::detail::rtree::visitors::insert.
          o #727 MSVC warning: conditional expression is constant.
      + Bugfixes
          o PR#700 Missing cases for default strategies in distance algorithm.
          o PR#738 Longitudes out of range in direct geodesic formulas.
  * GIL:
      + Added
          o Added new constructor initializing any_image from r-value reference
            to any image (PR#486).
          o Implemented mechanism to reverse kernel_2d (PR#489).
      + Changed
          o BREAKING: Replace Boost.Variant with Boost.Variant2 (PR#474) which
            completes removal on uses of Boost.MPL (missing from Boost 1.72.0
            change added PR#274).
          o Use perfect forwarding from apply_operation to visit (PR#491).
      + Removed
          o BREAKING: Removed dependency on Boost.Variant
      + Fixed
          o Fixed invalid conversion from RGB8 to CMYK32 due to overflow (PR#
            470).
          o Fixed image constructor from other image (PR#477).
          o Fixed error plane_view_t is not a class or namespace name (PR#481).
          o Fixed interleaved_view factory using point<std::ptrdiff_t> for
            dimension (PR#487).
          o Fixed documentation replacing uses MPL with MP11 in tutorial (PR#
            494).
          o Fixed missing header in numeric/kernel.hpp to make it
            self-contained (PR#502).
      + Acknowledgements
          o Samuel Debionne, Pranam Lashkari, Mateusz Loskot, Debabrata Mandal
  * Heap:
      + Correct destruction of top node in skew_heap. (Glen Fernandes)
      + Correct and simplify allocator use. (Glen Fernandes)
  * Integer:
      + Fixed compilation of gcd in C++20 mode with clang 10.
      + Improved support for Embarcadero compilers. (PR#21)
  * Iterator:
      + boost/function_output_iterator.hpp header is now deprecated. Users
        should replace its inclusion with boost/iterator/
        function_output_iterator.hpp. (PR#51)
      + Improved support for Embarcadero compilers. (PR#55)
  * LexicalCast:
      + Fixed warnings on missing override (thanks to EugeneZelenko #35, #34).
      + Fixes for the the Embarcadero compilers (thanks to Edward Diener).
  * Log:
      + Bug fixes:
          o The syslog sink backend now verifies the IP version of the local
            and target addresses set by user. The addresses must have the same
            IP version as was specified in the ip_version named parameter on
            the sink backend construction (by default, IPv4 is assumed). When
            an address is obtained as a result of host name resolution, only
            addresses with matching IP version are considered. (#119)
      + New Features:
          o Move constructors and assignment operators of various components
            were marked noexcept.
          o Added a new range_manip stream manipulator that can be used for
            outputting elements of a range, optionally separated by a
            delimiter.
          o Added a new tuple_manip stream manipulator that can be used for
            outputting elements of a tuple or any other heterogeneous sequence,
            optionally separated by a delimiter.
          o Added a new optional_manip stream manipulator that can be used for
            outputting optionally present values.
      + See changelog for more details.
  * Mp11:
      + Improved compilation performance of mp_with_index<N> for large N.
      + Added tuple_transform (contributed by Hans Dembinski.)
  * Multi-index Containers:
      + Added node extraction and insertion following the analogous interface
        of associative containers as introduced in C++17. This feature has also
        been extended to non key-based indices, in contrast to C++ standard
        library sequence containers, which do not provide such functionality.
      + Clarified documentation on read/write key extractors (issue #32).
      + Maintenance work.
  * Nowide:
      + The library now requires a C++11-compliant compiler and stdlib
      + LFS: Add support for files > 2 GB where the underlying system supports
        it
      + Generic UTF conversion functions are now available in the boost::nowide
        ::utf namespace
      + Add support for stat with UTF-8 paths
  * Outcome:
      + Announcements:
          o The v2.1 branch is expected to be retired end of 2020, with the
            v2.2 branch becoming the default. You can use the future v2.2
            branch now using better_optimisation. This branch has a number of
            major breaking changes to Outcome v2.1, see the front page for
            details.
      + Enhancements:
          o BREAKING CHANGE void results and outcomes no longer default
            construct types during explicit construction. Previously if you
            explicitly constructed a result<T> from a non-errored \ 
result<void>,
            it default constructed T. This was found to cause unhelpful
            surprise, so it has been disabled.
          o New macro OUTCOME_ENABLE_LEGACY_SUPPORT_FOR. The macro
            OUTCOME_ENABLE_LEGACY_SUPPORT_FOR can be used to enable aliasing of
            older naming and features to newer naming and features when using a
            newer version of Outcome.
          o Concepts now have snake case style naming instead of camel case
            style. When Outcome was first implemented, it was thought that C++
            20 concepts were going to have camel case style. This was changed
            before the C++ 20 release, and Outcome's concepts have been renamed
            similarly. This won't break any code in Outcome v2.1, as
            compatibility aliases are provided. However code compiled against
            Outcome v2.2 will need to be upgraded, unless
            OUTCOME_ENABLE_LEGACY_SUPPORT_FOR is set to 210 or lower.
          o Concepts now live in OUTCOME_V2_NAMESPACE::concepts namespace.
            Previously concepts lived in the convert namespace, now they live
            in their own namespace.
          o New concepts basic_result<T> and basic_outcome<T> added. \ 
End users
            were finding an unhelpful gap in between is_basic_result<T> and
            value_or_error<T> where they wanted a concept that matched types
            which were basic_result, but not exactly one of those. Concepts
            filling that gap were added.
          o Operation TRY works differently from Outcome v2.2 onwards. This is
            a severely code breaking change which change the syntax of how one
            uses OUTCOME_TRY(). A regular expression suitable for upgrading
            code can be found in the list of changes between Outcome v2.1 and
            v2.2.
      + Bug fixes:
          o #224 The clang Apple ships in Xcode 11.4 (currently the latest) has
            not been patched with the fixes to LLVM clang that fix noexcept(std
            ::is_constructible<T, void>) failing to compile which I originally
            submitted years ago. So give up waiting on Apple to fix their
            clang, add a workaround to Outcome.
          o Spare storage could not be used from within no-value policy
            classes. Due to an obvious brain fart when writing the code at the
            time, the spare storage APIs had the wrong prototype which
            prevented them working from within policy classes. Sorry.
  * PolyCollection:
      + Fixed internal ambiguity problem between boost::type_erasure::any and
        boost::any (issue #17).
      + Maintenance work.
  * SmartPtr:
      + Added owner_equals to shared_ptr, weak_ptr, local_shared_ptr.
      + Added owner_hash_value to shared_ptr, weak_ptr.
      + Added owner_equal_to, owner_hash.
      + Added std::hash specializations for shared_ptr, local_shared_ptr.
      + Added boost::hash support to, and std::hash, std::equal_to
        specializations for, weak_ptr.
  * Stacktrace:
      + Fixed a build error when compiled with -fno-exceptions (thanks to
        Jeremiah Rodriguez #91).
  * System:
      + operator bool() now returns failed() instead of value() != 0.
  * Type_Traits:
      + Implemented conjunction, disjunction, negation, is_trivially_copyable,
        is_scoped_enum, and is_unscoped_enum. (Glen Fernandes)
  * Variant:
      + Fixed warnings on missing override (thanks to EugeneZelenko #78).
      + Fixes for the the Embarcadero compilers (thanks to Edward Diener #79).
      + Updated header locations to avoid warnings about using deprecated
        headers (thanks to Andrey Semashev #80)
  * Variant2:
      + Added support for derived types in visit.
      + Improved compilation performance for many (hundreds of) alternatives.
      + Added support for visit<R>.
  * Wave:
      + Implement C++20 features for variadics, including __VA_OPT__ (PR#75)
      + Implement __has_include (PR#102)
      + Introduce new sample: check_macro_naming, useful with Boost itself (PR#
        97)
      + Fix compilation issue caused by std::allocator member removal in C++20
        (PR#72)
      + Repair Xpressive lexer and token_statistics sample (PR#79)
      + Repair lexertl lexer (PR#78)
      + Ensure hooks are run on predefined macros as well (PR#87)
      + Various minor bug fixes
      + C++98/03 support is now deprecated and will be removed in 1.77
  * YAP:
      + Fixed compilation errors for placeholders; they now work in the general
        case, and in particular work with yap::print().
      + constexpr all the YAP.
      + Fix printing of correct value category in yap::print().
      + Doc clarification.

Updated Tools

  * Boostbook:
      + Change encoding of generated documentation from US-ASCII to UTF-8.
        (Glen Fernandes)
   2020-05-06 15:33:53 by Adam Ciarcinski | Files touched by this commit (17) | Package updated
Log message:
boost: updated to 1.73.0

1.73.0:

Known Issues
------------
These are patches from library authors which were found too late to be fixed in \ 
the release. Be careful as they have not been through the normal testing \ 
process.

New Libraries
-------------
Nowide:
Standard library functions with UTF-8 API on Windows, from Artyom Beilis.

StaticString:
A dynamically resizable string of characters with compile-time fixed capacity \ 
and contiguous embedded storage, from Vinnie Falco and Krystian Stasiowski

Updated Libraries
-----------------
Align:
* Update aligned_alloc to support older mingw32.
Any:
* Speedup compilation by not including <algorithm>.
* Maintenance work, including CI hardening.
Asio:
* Fixed compatibility with C++20 concept syntax.
* Marked the POSIX descriptor classes' move constructors as noexcept.
* Added the ssl::host_name_verification class, which is a drop-in replacement \ 
for ssl::rfc2818_verification. The ssl::rfc2818_verification class has been \ 
marked as deprecated. As a consequence of this change, SSL support now depends \ 
on functions that were introduced in OpenSSL 1.0.2.
* Added an ssl::context constructor to take ownership of a native handle.
* Changed C++ language version detection with gcc to use __cplusplus macro.
* Fixed a work counting issue in the asynchronous resolve operation for endpoints.
* Fixed the strand<> converting constructors and assignment operators.
* Ensured that resolvers are restarted correctly after a fork.
* Fixed compatibility with the current NetBSD release.
* Removed spurious handler requirement checks in some async_read overloads.
* Changed the ssl::context class to propagate non-EOF errors from the \ 
add_certificate_authority function.
* Fixed a Windows-specific thread_pool destructor hang that occurred when the \ 
pool had an associated I/O object.
* Changed the select reactor to recreate the "self pipe trick" sockets \ 
on error. This addresses an issue on some versions of Windows, where these \ 
sockets are discconected after a system sleep.
* Fixed a compile error in the buffered streams due to the lack of reference \ 
collapsing in C++98.
* Changed the priority_scheduler example to demonstrate calls to shutdown() and \ 
destroy().
* Removed some unnecessary null pointer checks.
* Changed Windows platform detection to recognise TV titles as Windows apps.
* Added some emscripten compatibility patches.
* Fixed a compile error in the use_awaitable_t::as_default_on function.
* Changed all uses of the boost.bind placeholders to use the boost::placeholders \ 
namespace.
* Fixed a potential compile error in the async_compose implementation due to \ 
incorrect overload selection.
* Suppressed some non-virtual destructor warnings.
* Various documentation fixes and improvements.
Assert:
* Added source_location.
Atomic:
* Implemented C++20 atomic_ref. See docs and especially the caveats section.
* Implemented atomic_flag::test operation, which was introduced in C++20.
* atomic<T> should now take into account alignment requirements of T, \ 
which makes a difference if those requirements are higher than that of the \ 
internal storage of atomic.
* Added static asserts enforcing the requirements on the value type T used with \ 
atomic and atomic_ref. This should prohibit invalid types from being used as \ 
atomics.
* Improved internal lock pool implementation. The pool is larger, and lock \ 
selection accounts for atomic object alignment, which should reduce the \ 
potential of thread contention.
* Fixed incorrect x86 code generated for bit_test_and_* operations on 8 and \ 
16-bit arguments. Other architectures are not affected.
* Fixed a possible unaligned memory access in compare_exchange_* operations, if \ 
alignment requirements of value_type are less than that of the internal storage \ 
of atomic.
* boost/atomic/atomic.hpp no longer includes boost/atomic/atomic_flag.hpp and \ 
boost/atomic/fences.hpp and only defines the boost::atomic class template and \ 
related typedefs. Include the other headers explicitly or use boost/atomic.hpp \ 
to include all parts of Boost.Atomic.
* The atomic<T>::storage() accessor and associated \ 
atomic<T>::storage_type type are deprecated. Instead, users are advised to \ 
use atomic<T>::value() and atomic<T>::value_type, respectively. \ 
Users can define BOOST_ATOMIC_SILENCE_STORAGE_DEPRECATION to disable deprecation \ 
warnings for the time of transition. The deprecated pieces will be removed in a \ 
future release.
* Removed support for BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST. This macro was \ 
used as a helper for transition to the updated returned values of *_and_test \ 
operations in Boost.Atomic 1.67, which was released 2 years before 1.73.
Beast:
* This is a maintenance update.
* Nested mutable_data_type in Beast dynamic buffers is deprecated.
* We'd love to know how you or your company use Beast, consider adding an entry \ 
to the Companies and Individuals Using Beast list.
* See the full Release Notes for a complete list of changes.
Context:
* IBM Z: Fix fcontext routines
* mips64/n64: .align 3
* Use OSPLAT MIPS32/MIPS64 to set different ABI
* Fix non-PIC in RISC-V assembly
Conversion:
* Added boost::polymorphic_downcast for references (thanks to Julien Delacroix \ 
for the patch).
* Significant docs update.
date_time:
* Support constexpr in c++14 and above
* Make date_time all inline. Users no longer need to link the library for any \ 
functions. Library remains for build compatibility.
* Deprecate support for legacy io and USE_DATE_TIME_PRE_1_33_FACET_IO macro
* Misc documentation updates and bugfixes.
DLL:
* Fixes and tests for demangling in boost::dll::smart_library
* Make UB sanitizers happy with boost::dll::load_mode::type
* Ceased dependence on MPL improving compile times
* Clang and ICC on Windows fixes and CI support for those platforms
* Maintenance work, including CI hardening and tests improving.
Dynamic Bitset:
* Fixed a portability issue in the definition of the maximum block limit.
Flyweight:
* Maintenance work.
Geometry:
* Improvements
  - Missing input combinations in intersection() and introduction of tupled-output.
  - Added d3::point_xyz geometry model (thanks to Digvijay Janartha).
* Solved issues
  - Incorrect definition of EPSG:3785.
* Bugfixes
  - R-tree exception-safety improvement.
  - Andoyer inverse formula fixed for close points.
  - Fixed dangling reference in distance algorithm.
* Deprecation
  - Support for C++03 has been deprecated and Geometry will require C++14 from \ 
Boost 1.75 onwards.
GIL:
* Added move constructor and move assignment operator to image class
* New member function size() in any_image_view class
* Replace Boost.Test with Boost.LightweightTest as the only test framework used \ 
in GIL. This also restructured the test/extension/io/ sub-tree and targets in \ 
related Jamfile-s.
* Removed remaining uses of Boost.MPL
* Renamed all macros using BOOST_GIL_ prefix
* Renamed all CMake configuration options using BOOST_GIL_ prefix
* Removed extension/dynamic_image/reduce.hpp as unused and possibly unfinished. \ 
An implementation attempt of techniques described in the paper Efficient \ 
Run-Time Dispatching in Generic Programming with Minimal Code Bloat by Lubomir \ 
Bourdev, Jaakko Jarvi.
* Removed direct dependency on Boost.MPL, Boost.System and Boost.Test.
* Started removing public macros for compile-time configuration of I/O extension \ 
tests, i.e. BOOST_GIL_IO_TEST_ALLOW_READING_IMAGES and \ 
BOOST_GIL_IO_TEST_ALLOW_WRITING_IMAGES. Instead, if a test target is built, it \ 
builds all its test cases unconditionally.
* Avoid longjmp interaction during destruction of I/O extension objects.
* Fixed missing alignment default value in constructor of image class.
* Fixed segmentation fault when reading corrupted PNG file.
* Fixed illegal initialization of return values in the old IOv1 interface of I/O \ 
extension.
Histogram:
* Added crop command to reduce algorithm
* slice command in reduce now works on category axis
* Added count accumulator, can be used to add arbitrary metadata to each cell
* sum algorithm gained a new argument to optionally sum only over inner bins
* Several fixes for bugs in corner cases
* Enhanced documentation
icl:
* Remove references to date_time compiled library.
* Fix forward decl lower and upper less equal.
* Misc bugfixes.
IO:
* Made all the IOS state saver classes non-copyable. (Glen Fernandes)
* Correctly handle error upon first read from the input stream when reading a \ 
quoted string. (Glen Fernandes)
* Implemented ostream_joiner for delimiter based joining. (Glen Fernandes)
* Relocated ostream_string from the Utility library to the IO library as ostream_put.
* Correctly handle stream width and fill in quoted output. (Glen Fernandes)
* Optimize quoted output to write directly to the stream buffer. (Glen Fernandes)
* Glen Fernandes became the maintainer of the IO library.
LexicalCast:
* Maintenance work, including CI hardening and better workarounds for broken \ 
standard libraries
Log:
* Default sink used in trivial logging, when no sinks are registered in the \ 
logging core, now automatically flushes output after each log record
* core::flush now performs a flush on the default sink used for trivial logging, \ 
when no sinks are registered.
* Added a workaround for some syslog API implementations (e.g. glibc), which do \ 
not save the application identification string in openlog call. Such \ 
implementations could access already freed memory on each syslog call, resulting \ 
in undefined behavior.
* Fixed that log file rotation on a specific day of month (e.g. \ 
rotation_at_time_point(boost::gregorian::greg_day(1))) could be silently ignored \ 
and not happen.
* Fixed that text_file_backend::rotate_file could throw if there were no log \ 
records written yet and target file name pattern was set.
* Ported various components of the library to std::allocator_traits to improve \ 
compatibility with C++20 allocators.
* Fixed compilation errors when building in MSYS2 Cygwin environment.
Math:
IMPORTANT: C++03 support is now deprecated and will be removed from March 2021.
* Added Cubic Hermite Interpolation.
* Added Modified Akima Interpolation.
* Added PCHIP Interpolation.
* Added Quintic Hermite Interpolation.
* Added entropy to numerous distributions.
* Allow trivial quadrature case where the two end points are equal, and in \ 
addition allow bounds to be interchanged.
* Fix exp_sinh quadrature to work with complex types over a non-native range.
* Fix miscellaneous compiler warnings in factorial.hpp.
* Use std::chrono rather than boost::chrono in timed pFq calculations.
* Remove much of the old boost::mpl dependencies to improve constexpr support.
Mp11:
* Added mp_unique_if (contributed by Kris Jusiak)
* Added mp_flatten
* Added mp_rotate_left, mp_rotate_right (contributed by Duncan Barber)
* Added mp_compose
* Added mp_power_set
* Added mp_partial_sum
* Added mp_iterate
Multi-index Containers:
* multi_index_container is now AllocatorAware.
* Swapping of internal KeyFromValue, Compare, Hash and Pred objects now selects \ 
the appropriate swap function between std::swap and ADL candidates, in \ 
accordance with standard specifications in [swappable.requirements]
* Provided some internal copy constructors and assignment operators whose \ 
default implicit definition is deprecated in C++11 onwards ([depr.impldec]), \ 
which was warned about on some compilers.
Multiprecision:
* IMPORTANT: Mark C++03 support as deprecated and due for removal in 2021.
* Big update to cpp_int adds faster Karatsuba and Coomba multiplication routines.
* Fix conversion of gmp_rational to long double and __float128
* Fix up libtommath support to function with the latest libtom releases.
* Fix up some incompatibilities with the latest Intel C++ compiler.
* Fix up constexpr arithmetic support for latest MSVC release.
Outcome:
* Performance of Outcome-based code compiled by clang has been greatly improved. \ 
The previous implementation of Outcome's status bitfield confused clang's \ 
optimiser, which caused low quality codegen. Unlike most codegen issues, this \ 
was noticeably in empirical benchmarks of real world code, as was shown by P1886 \ 
Error speed benchmarking.
* The safe part of the better_optimisation Outcome v2.2.0 future branch was \ 
merged to Outcome v2.1.3 which includes a new status bitfield implementation. \ 
This appears to not confuse clang's optimiser, and clang 9 produces code which \ 
routinely beats GCC 9's code for various canned use cases.
* Installability is now CI tested per commit. Due to installability of \ 
standalone Outcome (e.g. make install) breaking itself rather more frequently \ 
than is ideal, installability is now tested on CI per commit.
* Newer Concepts implementing compilers were unhappy with the early check for \ 
destructibility of T and E, so removed template constraints, falling back to \ 
static assert which runs later in the type instantiation sequence.
* A false positive undefined behaviour sanitiser failure in some use cases of \ 
Experimental Outcome was worked around to avoid the failure message.
PolyCollection:
* Suppressed a potential redundant move warning in boost::poly_collection::for_each.
* Fixed a bug by which elements were copied rather than moved in \ 
allocator-extended move construction and move assigment between collections with \ 
non-propagating, unequal allocators.
* Allocator-extended move construction no longer decays to allocator-extended \ 
copy construction for the legacy version of libstdc++-v3 shipped with GCC 4.8 \ 
(which can also be used by Clang).
Stacktrace:
* Added documentation on distribution of PDBs
* Fixed msvc-9 build
* Maintenance work, including test fixes fixing typos CI improvements and \ 
hardening, inspect tool fixes.
Test:
* Boost.test v3.13 see the Changes log for more details.
* New feature: It is now possible to combine tolerance indication, user message \ 
and collection comparison modifier in a single BOOST_TEST expression. See change \ 
logs for more details.
ThrowException:
* Added an overload of throw_exception that takes a boost::source_location object.
* NOTE: Projects using BOOST_THROW_EXCEPTION with exceptions disabled will need \ 
to add a definition of this new overload.
TTI:
* Added introspection of function templates for more recent C++ compilers \ 
versions from gcc and vc++. as well as all versions of clang. Older versions of \ 
vc++ before 14.0 and gcc prior to 4.8 may fail.
* Added specific introspection for elements of struct/class, enum, and union \ 
types, which can be used for more fine-grained introspection than the general \ 
'type' introspection.
TypeIndex:
* Maintenance work, including CI integration with inspect tool.
Utility:
* The ostream_string facility has moved from the Utility library to the IO \ 
library as ostream_put.
Variant:
* Removed unused includes
* Fixed zero-as-null-pointer-constat warnings
* Maintenance work, including typo fixes.
Variant2:
* Added support for std::hash, boost::hash.
* variant<T...> is now trivial when all types in T... are trivial. This \ 
improves performance by enabling it to be passed to, and returned from, \ 
functions in registers.
WinAPI:
* Headers in boost/detail/winapi are deprecated and will be removed in a future \ 
release.
* Boost.WinAPI headers no longer include winerror.h. Include \ 
boost/winapi/error_codes.hpp to get Windows error codes.
   2020-01-12 11:10:04 by Adam Ciarcinski | Files touched by this commit (16) | Package updated
Log message:
boost: updated to 1.72.0

Version 1.72.0

Asio:
Changed the async_initiate helper function to automatically deduce its return \ 
type, for C++11 or later.
Changed all asynchronous operations to use automatically deduced return types, \ 
for C++14 or later.
Introduced concepts to support async_initiate.
Added the nested template type rebind_executor to all I/O object types.
Changed the initiation function objects to report their associated I/O executor \ 
via the nested type executor_type and member function get_executor().
Added the default_completion_token trait, giving I/O executor types an \ 
associated default completion token type for use with asynchronous operations. \ 
This trait is specialised for the use_awaitable completion token, for example, \ 
to allow asynchronous operations to be used as follows: co_await \ 
socket.async_connect(my_endpoint).
Added missing async_initiate to the Windows-specific I/O objects' asynchronous \ 
operations.
Ensured that the executor type is propagated to newly accepted sockets.
Changed to require that Protocol copy and move operations never throw.
Changed to require that Endpoint default constructor and move operations never throw.
Added the noexcept qualifier to protocol accessors.
Added the noexcept qualifier to socket move constructors.
Fixed issues associated with opening serial ports on Windows:
Use the correct constant to initialise the RTS control flag.
Specify a default baud rate (9600).
Fixed a lost "outstanding work count" that can occur when an \ 
asynchronous accept operation is automatically restarted.
Consult the Revision History for further details.

Atomic:
Added a workaround for __float128 not being considered as a floating point type \ 
by some versions of libstdc++.
Improved compatibility with clang-win compiler.

Beast:
This is a maintenance update containing bug fixes, and updates to use the new \ 
features delivered in Boost.Asio.
We'd love to know how you or your company use Beast, consider adding an entry to \ 
the Companies and Individuals Using Beast list.
See the full Release Notes for a complete list of changes.

Circular Buffer:
Fix: max_size() now takes the allocator's max_size() into account. (Glen Fernandes)

Context:
architecture s390x supported
execution_context removed

Endian:
Made endian_reverse, conditional_reverse and *_to_* constexpr on GCC and Clang
Added convenience load and store functions
Added floating point convenience typedefs
Added a non-const overload of data(); changed its return type to unsigned char*
Added __int128 support to endian_reverse when available
Added a convenience header boost/endian.hpp

Filesystem:
Extracted filesystem_error to exception.hpp; file_status and associated enums \ 
and functions to file_status.hpp; directory_entry, directory_iterator and \ 
recursive_directory_iterator to directory.hpp.
Deprecated: For backward compatibility operations.hpp still includes the new \ 
headers exception.hpp, file_status.hpp and directory.hpp, unless \ 
BOOST_FILESYSTEM_NO_DEPRECATED macro is defined. These implicit includes are \ 
considered deprecated and will be removed in a future release. Users are \ 
encouraged to include the new headers directly or include filesystem.hpp.
The filesystem_error exception is now implemented in the compiled library of \ 
Boost.Filesystem. Users may need to add linking with Boost.Filesystem library in \ 
their projects.
On POSIX.1-2008 platforms, use utimensat instead of utime. utime is declared \ 
obsolete in POSIX.1-2008 and can be disabled e.g. in uClibc-ng.
directory_iterator is now left in the end state on memory allocation errors.
In directory_iterator on POSIX systems, support for readdir/readdir_r has been \ 
reworked to avoid memory allocations for dirent structures when readdir is used. \ 
This reduces memory consumption and eliminates the possibility of buffer \ 
overruns in case if readdir produces a very long directory name.
On Windows, use Boost.WinAPI to select the target Windows version.
New: Added directory_options enum, which reflects the same named enum from \ 
C++20. The enum is supported in directory_iterator and \ 
recursive_directory_iterator to customize iteration behavior. In particular, the \ 
iterators now support skipping directories that can't be opened due to \ 
insufficient permissions. The symlink_option enum is now deprecated and should \ 
be replaced with directory_options.
By default, recursive_directory_iterator is now reset to the end state in case \ 
of errors, as required by C++20.
New: Added directory_options::pop_on_error option, which configures \ 
recursive_directory_iterator so that it attempts to recover from iteration \ 
errors by repeatedly invoking pop() until it succeeds or the end state is \ 
reached.
New: Added directory_options::skip_dangling_symlinks option, which configures \ 
recursive_directory_iterator so that it doesn't follow dangling directory \ 
symlinks and continues iteration instead of reporting an error.
Deprecated: The following members of recursive_directory_iterator are now marked \ 
as deprecated: level(), no_push_pending(), no_push_request(), no_push(). Users \ 
are advised to replace their use with the standard counterparts: depth(), \ 
recursion_pending(), disable_recursion_pending(). Note that recursion_pending() \ 
has the opposite meaning compared to no_push_pending() and no_push_request(). \ 
Deprecated methods will be removed in a future release.
Fixed path::lexically_relative (and any dependent algorithms) to correctly \ 
handle empty, dot and dot-dot path elements in its argument. The behavior is \ 
made closer to C++17 std::path::lexically_relative in that empty and dot path \ 
elements are ignored and dot-dot path elements are accounted by decreasing the \ 
number of dot-dot path elements to generate in the resulting relative path.

Functional/Factory:
Glen Fernandes rewrote the implementations of factory and value_factory to \ 
provide the following features:
Support r-value arguments when possible
Support arbitrary number of arguments via variadic templates when possible
Support allocators that are final
Support allocators that use fancy pointers
Support for disabled exceptions (BOOST_NO_EXCEPTIONS)
Improved compilation times
The following features have been removed:
Increasing limits for C++03 compilers through \ 
BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
Using boost::none_t in place of void through BOOST_FUNCTIONAL_FACTORY_SUPPORT_NONE_T

GIL:
Added
GSoC 2019: Lanczos resampling for image down scaling.
GSoC 2019: Methods for binary thresholding, inverted binary thresholding and \ 
truncation thresholding.
GSoC 2019: Otsu thresholding method.
GSoC 2019: Adaptive thresholding using mean or gaussian-weighted sum of the \ 
neighbourhood area.
GSoC 2019: Harris response calculation (corner detector without non-maximum \ 
filtering).
GSoC 2019: Hessian corner detector.
GSoC 2019: Types for defining 2D kernel, kernel_2d and kernel_2d_fixed, in \ 
Numeric extension.
GSoC 2019: Implementation of 2D convolution as new function convolve_2d.
GSoC 2019: Box filtering using the average filter.
GSoC 2019: Blur function based on normalized mean filter.
GSoC 2019: Sobel and Scharr operators.
GSoC 2019: Median filter to remove noise from image.
Continued adding new test cases and significantly improved overall test coverage.
Documented purpose of cached_location_t.
Function convolve_1d in Numeric extension for convenient use of convolve_rows \ 
and convolve_cols.
Function extend_boundary in Numeric extension to perform image boundary extension.
Project release notes maintained in Markdown file RELEASES.md.

Changed
Move all tests, core features and extensions, inside test/ directory.

Removed
Replace Boost.MPL with Boost.MP11.
Removed use of Boost.TypeTraits.
Dropped support for GCC <= 4.8.
Remove include/boost/gil/version.hpp file as unused.

Fixed
Undetermined value of default-initialized channel and pixel objects.
Undefined behaviour due to std::is_trivially_default_constructible specializations.
Crash when reading PNG files with an invalid header.
Applied the Rule of Three for numerous types.
Removed uses of deprecated implicit definition of defaulted copy assignment \ 
operator or copy constructor.

Histogram:
Several new features and performance improvements, some bug-fixes
See the full Release Notes for a complete list of changes

Log:
Improved compatibility with clang-win compiler.

MPI:
Documentation clarifications.
Fixed scatterv bug when using explicit input buffer offsets.
Enable usage of MPI_Probe and friend with Intel MPI >= 2019.4
Symbol visibility on Windows

Math:
Added Hypergeometric functions 1F0, 0F1, 2F0, 1F1 and pFq.
Added Jacobi polynomial (and derivatives) evaluation.
Added Gegenbauer polynomial (and derivatives) evaluation.
Added Cardinal B-Splines (and derivatives) as polynomial functions in their own \ 
right.
Added Cardinal Trigonometric Interpolation.
Added new statistics sub-section.
Added One Sample Student's T Test.
Added Anderson Darling test for normality.
Added Ljung Box test for auto-correlation.
Added Runs test for random sequences.
The headers boost/math/tools/univariate_statistics.hpp and \ 
boost/math/tools/bivariate_statistics.hpp, have been deprecated in favor of \ 
boost/math/statistics/univariate_statistics.hpp and \ 
boost/math/statistics/bivariate_statistics.hpp.
Added The Empirical CDF distribution.
Reworked the Sterling approximation used by multiprecision gamma functions to be \ 
applicable to all the function that use the Lanczos approximation at regular \ 
precision. Also extended Lanczos approximations up to 100 decimal digit \ 
precision.

Multiprecision:
Big constexpr update allows cpp_int and float128 arithmetic to be fully \ 
constexpr with gcc and clang 9 or later, or any compiler supporting \ 
std::is_constant_evaluated().
Fix bug in variable precision mpf_float which causes it to go into a tailspin \ 
trying to select the correct precision - see \ 
https://github.com/boostorg/multiprecision/issues/164.

Outcome:
Enhancements:
Standalone outcome is now make install-able, and cmake find_package() can find \ 
it. Note that you must separately install and find_package() Outcome's \ 
dependency, quickcpplib, else find_package() of Outcome will fail.
The git submodule mechanism used by standalone Outcome of specifying dependent \ 
libraries has been replaced with a cmake superbuild of dependencies mechanism \ 
instead. Upon cmake configure, an internal copy of quickcpplib will be git \ 
cloned, built and installed into the build directory from where an internal \ 
find_package() uses it. This breaks the use of the unconfigured Outcome repo as \ 
an implementation of Outcome, one must now do one of: 1. Add Outcome as \ 
subdirectory to cmake build. 2. Use cmake superbuild (i.e. \ 
ExternalProject_Add()) to build and install Outcome into a local installation. \ 
3. Use one of the single header editions.
For standalone Outcome, the current compiler is now checked for whether it will \ 
compile code containing C++ Concepts, and if it does, all cmake consumers of \ 
Outcome will enable C++ Concepts. Set the cmake variable CXX_CONCEPTS_FLAGS to \ 
an empty string to prevent auto detection and enabling of C++ Concepts support \ 
occurring.
OUTCOME_TRY operation now hints to the compiler that operation will be \ 
successful. [P1886 Error speed benchmarking](https://wg21.link/P1886) showed \ 
that there is considerable gain in very small functions by hinting to the \ 
compiler whether the expression is expected to be successful or not. OUTCOME_TRY \ 
previously did not hint to the compiler at all, but now it does. A new suite of \ 
macros OUTCOME_TRY_FAILURE_LIKELY hint to the compiler that failure is expected. \ 
If you wish to return to the previously unhinted behaviour, define \ 
OUTCOME_TRY_LIKELY(expr) to (!!expr).
Support for C++ Coroutines has been added. This comes in two parts, firstly \ 
there is now an OUTCOME_CO_TRY() operation suitable for performing the TRY \ 
operation from within a C++ Coroutine. Secondly, in the header \ 
outcome/coroutine_support.hpp there are implementations of \ 
eager<OutcomeType> and lazy<OutcomeType> which let you more \ 
naturally and efficiently use basic_result or basic_outcome from within C++ \ 
Coroutines -- specifically, if the result or outcome will construct from an \ 
exception pointer, exceptions thrown in the coroutine return an errored or \ 
excepted result with the thrown exception instead of throwing the exception \ 
through the coroutine machinery (which in current compilers, has a high \ 
likelihood of blowing up the program). Both eager<T> and lazy<T> can \ 
accept any T as well. Both have been tested and found working on VS2019 and \ 
clang 9.
make_error_code() and make_exception_ptr() are now additionally considered for \ 
compatible copy and move conversions for basic_result<>. This lets you \ 
construct a basic_result<T, E> into a basic_result<T, error_code>, \ 
where E is a custom type which has implemented the ADL discovered free function \ 
error_code make_error_code(E), but is otherwise unrelated to error_code. The \ 
same availability applies for exception_ptr with make_exception_ptr() being the \ 
ADL discovered free function. basic_outcome<> has less support for this \ 
than basic_result<> in order to keep constructor count down, but it will \ 
accept via this mechanism conversions from basic_result<> and \ 
failure_type<>.

Bug fixes:
The detection of [[nodiscard]] support in the compiler was very mildly broken.

PolyCollection:
Maintenance work.

Preprocessor:
Topic added which discusses emptiness
Support for the C++20 __VA_OPT__ construct
BOOST_PP_VARIADIC_HAS_OPT whether __VA_OPT__ is supported at the C++20 level
BOOST_PP_CHECK_EMPTY test for emptiness using __VA_OPT__ at the C++20 level
BOOST_PP_VA_OPT more flexible alternative to __VA_OPT__ at the C++20 level

Smart Pointers:
Implemented allocate_unique for scalars and arrays. (Glen Fernandes)

Test:
Boost.test v3.12 see the Changes log for more details.
New feature:
Support for C++17 std::string_view has been added.
Better diagnostic on boost::exception and no rtti mode (thanks to Mikhail Pilin \ 
/ [pull_request 234])

VMD:
BOOST_VMD_IS_EMPTY updated to use __VA_OPT__ at the C++20 level has 100% reliability
   2019-08-30 17:30:44 by Ryo ONODERA | Files touched by this commit (1)
Log message:
Fix RELRO build, bump PKGREVISION

Reported by wiz@, thank you.