Release notes for work in progress boost

Version 1.57.0

In Progress

New Libraries

TODO

Updated Libraries

TODO

Compilers Tested

Boost's primary test compilers are:

TODO

Boost's additional test compilers include:

TODO

Acknowledgements

TODO

Version 1.56.0

Thu, 7 Aug 2014 09:08:22 -0700

Other Downloads

Windows binaries

Modularization

Boost version control has migrated to a system using git submodules. This shouldn't make too much of a difference to users, although the directory structure is now a bit different.

Parts of some libraries have been moved into different modules, and several new modules have been extracted from existing code. All header paths should remain the same. The new modules are:

Assert: Customizable assert macros. Maintained by Peter Dimov.
Core: Core utilities used by other libraries, with minimal dependencies. Maintained by Peter Dimov, Glen Fernandes and Andrey Semashev.
Lexical_Cast: General literal text conversions, such as an int represented a string, or vice-versa, from Kevlin Henney.
Throw_Exception: A common infrastructure for throwing exceptions from Boost libraries, from Emil Dotchevski.
Winapi: Windows API declarations without <windows.h>, for internal Boost use.

New Libraries

Align: Memory alignment functions, allocators, and adaptors, from Glen Fernandes.
Type_Index: Runtime/Compile time copyable type info, from Antony Polukhin.

Updated Libraries

Acumulators:
- New accumulators rolling_variance and rolling_moment
Any:
- Fixed rvalue references related issues (#9215, #9462).
- Dropped support of antique compilers.
Asio:
- Fixed asio::spawn() to work correctly with new Boost.Coroutine interface (#9442, #9928).
- Ensured that incomplete asio::spawn() coroutines are correctly unwound when cleaned up by the io_service destructor (#9731).
- Fixed delegation of continuation hook for handlers produced by io_service::wrap() and strand::wrap() (#9741).
- Changed the Windows I/O completion port backend to use ConnectEx, if available, for connection-oriented IP sockets.
- Changed the io_service backend for non-Windows (and non-IOCP Windows) platforms to use a single condition variable per io_service instance. This addresses a potential race condition when run_one() is used from multiple threads.
- Prevented integer overflow when computing timeouts based on some boost::chrono and std::chrono clocks (#9662, #9778).
- Made further changes to EV_CLEAR handling in the kqueue backend, to address other cases where the close() system call may hang on Mac OS X.
- Fixed infinite recursion in implementation of resolver_query_base::flags::operator~ (#9548).
- Made the select reactor more efficient on Windows for large numbers of sockets (#9528).
- Fixed a Windows-specific type-aliasing issue reported by gcc (#9550).
- Prevented execution of compile-time-only buffer test to avoid triggering an address sanitiser warning (#8295).
- Disabled the GetQueuedCompletionStatus timeout workaround on recent versions of Windows.
- Added support for string-based scope IDs when using link-local multicast addresses.
- Changed IPv6 multicast group join to use the address's scope ID as the interface, if an interface is not explicitly specified.
- Fixed multicast test failure on Mac OS X and the BSDs by using a link-local multicast address.
- Worked around a gcc problem to do with anonymous enums (#10042).
- Reverted the Windows HANDLE backend change to ignore ERROR_MORE_DATA. Instead, the error will be propagated as with any other (i.e. in an error_code or thrown as a system_error), and the number of bytes transferred will be returned. For code that needs to handle partial messages, the error_code overload should be used (#10034).
- Fixed an off-by-one error in the signal_set implementation's signal number check (#9324).
- Changed to use SSE2 intrinsics rather than inline assembly, to allow the Cray compiler to work.
- Stopped using certain Winsock functions that are marked as deprecated in the latest Visual C++ and Windows SDK.
- Added a workaround for building the unit tests with gcc on AIX.
- Various minor documentation improvements (#8295, #9605, #9771).
Assign:
- Resolve some C++11 ambiguities (#3073).
Atomic:
- The library has been redesigned. Besides internal refactoring, various bugs were fixed, including incorrect values of feature test macros and integer overflow handling.
- Changed values of the memory_order enumeration. The concrete values are not part of the interface, but this change may potentially break ABI, if the enum is used in user's interfaces.
- Implemented support for 128-bit atomic operations on Windows x64 with MSVC. The library assumes presence of the cmpxchg16b instruction in the target CPUs. Some early AMD CPUs don't support this instruction. To target those define the BOOST_ATOMIC_NO_CMPXCHG16B macro.
- Implemented experimental support for Windows ARM target with MSVC.
- Implemented experimental support for DEC Alpha target with GCC.
- Improved support for ARMv6 and later with GCC. Implemented all atomic operations as assembler blocks instead of CAS-based loops. 64-bit operations are supported with ARMv7.
- Implemented optional support for the BOOST_ATOMIC_FLAG_INIT macro and static initialization of atomic_flag. (#8158)
- Fixed compilation for SPARCv9 target. (#9446)
- Fixed compilation for PowerPC target. (#9447)
- Fixed several compatibility problems with Clang on x86 and x86-64. (#9610, #9842)
- Removed specialized code for Windows on IA64 platform.
Circular Buffer:
- #9970,#9334 Support for the C++11 allocator model.
- Dropped support of antique compilers.
Concept Check:
- Fewer warnings (includes #5012).
Container:
- Added DlMalloc-based Extended Allocators.
- Improved configurability of tree-based ordered associative containers. AVL, Scapegoat and Splay trees are now available to implement set, multiset, map and multimap.
- Fixed bugs:
Context:
- fcontext_t is opaque pointer to context-data
- changed signature of make_fcontext()
- #8826 no executable stack
- #9437 catch exceptions on iOS and Windows Phone 8
- #9445 support for x32 ABIs
- #9522 support for powerpc_64le
- #9743 bugfix for powerpc_64 le/be
- #9774 bugfix for x86 on Mac OS X + clang
Coroutine:
- support of symmetric coroutines
- #9355 fix race condition in protected_stack_allocator
- #9551 list of supported architectures
- #9734 wrong check of mmap() return value
- #9735 no memset() for protected_stack_allocator
- #9760 coroutine iterator need const operator==
- #10070 mmap() return value
- #10157 file descriptor not required in protected_stack_allocator
Dynamic Bitset:
- Support for C++11 move constructors
- Warning fixes on MSVC 2013
- Support for C++11 minimal allocators
- Add noexcept specifications
Chrono:
- #6918 Boost Chrono compilation failure on HP uX due to undefined pthread_getcpuclockid
- #8006 Boost::Chrono Assertion at startup - steady_clock::now() - Windows
- #9337 chrono::process_cpu_clock time points wrong by factor 1000 on Linux
- #9342 Regression on process_cpu_clock::timepoint io on V2
- #9419 boost::chrono::floor()/round() and negative durations is wrong
- #9698 boost::chrono::thread_clock not declared in OSX
- #9720 boost::this_thread::sleep_for() sometimes returns immediately on win32
- #9859 Remove references to gcc-mingw
- #9918 chrono compilation error on Solaris, funciton timegm
- #9811 boost/boost/chrono/duration.hpp:355:56: error: call to non-constexpr function 'static std::numeric_limits<float>::_Ty std::numeric_limits<float>::max()' /home/zosun/input_service/inputservices-core-service/other/boost/boost/chrono/duration.hpp: In static member function 'static constexpr double boost::chrono::detail::chrono_numeric_limits<double, true>::lowest()':
- #10069 Overflow in chrono clocks on 32bit
- #10151 timegm function not available on QNX
Flyweight:
- In compilers with variadic template support, boost::flyweight<T> now provides a perfectly forwarding constructor to T::T (previously an emulation was used).
- flyweight now replicates the initializer-list constructors and assignment operators of its underlying type.
- Fixed intermodule static initialization problem (ticket #9553).
- Maintenance fixes.
Fusion:
- Fusion is enabled for use on GPU
Geometry:
- Additional functionality
  - New algorithm buffer for inflating/deflating geometries (buffer itself already existed but that was only to enlarge a box)
  - New algorithm remove_spikes, algorithm to remove spikes from a ring, polygon or multi_polygon.
  - New algorithm point_on_surface, generating a point lying on the surface (interior) of the polygon
  - New algorithm is_simple, returning true if a geometry is simple according to the OGC standard
  - New algorithm is_valid, returning true if a geometry is valid according to the OGC standard
  - New algorithm crosses for checking this spatial relation according to the OGC standard
  - The set operation algorithms (difference, intersection, sym_difference and union_) now support as input pairs of pointlike or linear geometries
  - The distance and comparable_distance algorithms now support all pairs of geometry combinations
  - The spatial relations which didn't support it (covered_by, touches, within, etc.) now support as input linear and/or areal geometries
  - The support for boost::variants as input geometries in various algorithms
  - The rtree support for indexing segments
  - The rtree nearest() predicate support for arbitrary geometries
- Solved tickets
  - 8310 Wrong results with overlapping polygons (fixed using point_on_surface for disjoint)
  - 9081 Booleans create self-intersecting polygons from non-self-intersecting polygons
  - 9245 Check for process errors in make_qbk.py
  - 9563 (Sym)difference not successful, fixed by rescaling to robust type
  - 9628 Wrong result of within() due to the winding strategy not working correctly for nearly-horizontal segments
  - 9871 Remove spike in polygon with only a spike
  - 9947 Missing info about WKT in documentation
  - 10019 Difference of Linestring and Box returns their intersection
  - 10077 Wrong types in concept checks in boost/geometry/arithmetic/arithmetic.hpp
- Bug fixes
  - intersects(polygon) could return a self-intersection-point for its closing point, fixed
  - equals() could return invalid results for non-simple linear geometries according to the OGC standard, fixed
  - touches() didn't work properly for CCW areal geomtries, fixed
  - rtree nearest queries returned wrong elements for non-cartesian coordinate systems, fixed
  - rtree crashed in some cases when used with Interprocess allocator, fixed
Hash:
- Removed some Visual C++ 6 workarounds.
- Ongoing work on improving hash_combine, this changes the previously documented algorithm for the function.
Interprocess:
- Fixed bugs:
- ABI breaking: #9221 showed that BOOST_INTERPROCESS_MSG_QUEUE_CIRCULAR_INDEX option of message queue, was completely broken so an ABI break was necessary to have a working implementation.
- Simplified, refactored and unified (timed_)lock code based on try_lock(). There were several bugs when handling timeout expirations.
- Changed the implementation of condition variables' destructors to allow POSIX semantics (the condition variable can be destroyed after all waiting threads have been woken up)..
- Added BOOST_INTERPROCESS_SHARED_DIR_PATH option to define the shared directory used to place shared memory objects when implemented as memory mapped files.
- Added support for BOOST_USE_WINDOWS_H. When this macro is defined Interprocess does not declare used Windows API function and types, includes all needed windows SDK headers and uses types and functions declared by the Windows SDK.
- Added get_size to windows_shared_memory.
Intrusive:
- Improved Doxygen generated reference and updated and fixed forward-declaration header.
- ABI breaking: Fixed ABI regression introduced in Boost 1.55 version, mainly noticeable on MSVC compilers.
- Source breaking: Removed previously deprecated xxx_dont_splay functions from splay containers, splay_set_base_hook and splay_set_member_hookfrom splay containers and bool splay = true extra parameter in splaytree_algorithms functions.
- Fixed bugs:
- Optimized tree rebalancing code to avoid redundant assignments.
- Added 64 bit prime values for suggested_upper_bucket_count/suggested_lower_bucket_count in 64 bit platforms.
- Deleted workarounds for old SUN_CC compilers, those are now unsupported as modern SunPro compilers are standard-corforming enough.
Lexical Cast:
- Added the try_lexical_convert function, that retuns false in case of failed conversion and does not require output parameter to be Default Constructable (#6700).
- Fixed conversion of string values with leading zeroes to bool (#9659).
- Code was changed to produce a smaller binaries and simplify compiler's work (#9046).
- Boost.LexicalCast library was separated from the Boost.Conversion library.
- Fixed some warnings (#8991).
Log:
- General changes:
  - For Windows targets, the library now compiles for Windows XP by default.
  - Added indexing operators with attribute_name arguments to record and record_view.
  - Added operators for non-const object output to basic_formatting_ostream. (#9389)
  - Added support for putting function names and source file names of named scopes into the formatted strings. (#9263)
  - Added support for incomplete and empty markers to the named scope formatter. (#9123)
  - The default presentation for incomplete named scope lists has changed: trailing scope delimiter is omitted.
  - Added a support header for std::regex.
  - By default Boost.Log uses Boost.Regex internally as the regular expressions backend. The backend can be changed by defining configuration macros.
- Bug fixes:
  - Fixed dump manipulator output on AVX2-enabled CPUs (e.g. Intel Haswell).
  - Fixed compilation of get_attribute method of loggers.
  - Fixed a possible race in locked_backend() function implementation of synchronous and asynchronous sink frontends.
  - Fixed a possible infinite block of the logging threads in the asynchronous sink enqueue methods when block_on_overflow strategy was used.
- See changelog for more details.
Math:
- Breaking change: moved a number of non-core headers that are predominantly used for internal maintenance into libs/math/include_private. The headers effected are boost/math/tools/test_data.hpp, boost/math/tools/remez.hpp, boost/math/constants/generate.hpp, boost/math/tools/solve.hpp, boost/math/tools/test.hpp. You can continue to use these headers by adding libs/math/include_private to your compiler's include path.
- Breaking change: A number of distributions and special functions were returning the maximum finite value rather than raising an overflow_error, this has now been fixed, which means these functions now behave as documented. However, since the default behavior on raising an overflow_error is to throw a std::overflow_error exception, applications which have come to reply rely on these functions not throwing may experience exceptions where they did not before. The special functions involved are gamma_p_inva, gamma_q_inva, ibeta_inva, ibetac_inva, ibeta_invb, ibetac_invb, gamma_p_inv, gamma_q_inv. The distributions involved are pareto_distrib, beta_distrib, geometric_distrib, negative_binomial_distrib, binomial_distrib, chi_squared_distrib, gamma_distrib, inverse_chi_squared_distrib, inverse_gamma_distrib. See #10111.
- Fix round and trunc functions so they can be used with integer arguments, see #10066.
- Fix Halley iteration to handle zero derivative (with non-zero second derivative), see #10046.
- Fix Geometric distribution use of Policies, see #9833.
- Fix corner cases in the negative binomial distribution, see #9834.
- Fix compilation failures on Mac OS.
- Added bernoulli_numbers, changed arbitrary precision tgamma/lgamma to use Sterling's approximation (from Nikhar Agrawal).
- Added first derivatives of the Bessel functions: cyl_bessel_j_prime, cyl_neumann_prime, cyl_bessel_i_prime, cyl_bessel_k_prime, sph_bessel_prime and sph_neumann_prime (from Anton Bikineev).
- Fixed buggy Student's t example code, along with docs for testing sample means for equivalence.
- Documented max_iter parameter in root finding code better, see #9225.
- Add option to explicitly enable/disable use of __float128 in constants code, see #9240.
- Cleaned up handling of negative values in Bessel I0 and I1 code (removed dead code), see #9512.
- Fixed handling of very small values passed to tgamma and lgamma so they don't generate spurious overflows (thanks to Rocco Romeo).
- #9672 PDF and CDF of a Laplace distribution throwing domain_error Random variate can now be infinite.
- Fixed several corner cases in rising_factorial, falling_factorial and tgamma_delta_ratio with thanks to Rocco Romeo.
- Removed constant pow23_four_minus_pi whose value did not match the name (and was unused by Boost.Math), see #9712.
Move:
- Added BOOST_MOVE_RET.
- Fixed bug #9482: "MSVC macros not undefined in boost/move/detail/config_end.hpp", #9045: "Wrong macro name on docs", #8420: "move's is_convertible does not compile with aligned data".
MPL:
- boost::mpl::for_each is enabled for use on GPU
MultiArray:
- #5664 operator() checks for Collection concept but requires RandomAccessCollection
- #4874 compile errors using Visual C++ 2010 in debug mode
- #3581 MultiArray storage order example incorrect for fortran_storage_ordering
- #4032 Move MultiArray concepts out of detail namespace
- #9212 Broken links to C++ standard papers
- #8368 GCC -Wundef warning about BOOST_MULTI_ARRAY_NO_GENERATORS in multi_array
Multi-index Containers:
- The erase(iterator) member function of hashed indices used to have poor performance under low load conditions due to the requirement that an iterator to the next element must be returned (see ticket #4264). In accordance with the resolution of LWG issue #579, this problem has been fixed while maintaining the interface of erase, at the expense of using one more word of memory per element. In fact, C++ complexity requirements on unordered associative containers have been improved for hashed indices so that
  - deletion of a given element is unconditionally constant-time,
  - worst-case performance is not O(n) but O(n_dist), where n_dist is the number of non-equivalent elements in the index.
  Due to the fact that hashed indices rely on a new data structure, the internal representation of their iterators and local iterators have changed, which affects serialization: their corresponding serialization class version has been bumped from 0 to 1. Old archives involving hashed index (local) iterators can be loaded by Boost 1.56 version of Boost.MultiIndex, but not the other way around.
- Hashed indices now provide reserve.
- Hashed indices can now be checked for equality and inequality following the (suitably adapted) C++ standard specification in [unord.req].
- The public interface of Boost.MultiIndex provide noexcept specifications where appropriate (for compliant compilers).
- Improved performance of failed insertions into a multi_index_container.
- Much internal code aimed at supporting MSVC++ 7.0 and prior has been removed. Compilation times without this legacy code might be slightly faster.
- Fixed a bug with insertion via iterators dereferencing to rvalues (ticket #9665).
- Made Boost.MultiIndex compatible with BOOST_BIND_NO_PLACEHOLDERS (ticket #9798).
- Maintenance fixes.
Multiprecision:
- Change floating point to rational conversions to be implicit, see 10082.
- Fix definition of checked_cpp_rational typedef.
- Fix bug in assignment from string in cpp_int, see 9936.
- Added new cpp_bin_float backend for binary floating point.
- Fix bug in assignment from string in cpp_int, see 9936.
- Added MSVC-specific #include for compiler intrinsics, see 9336.
- Fixed various typos in docs, see 9432.
- Fixed gmp_rational to allow move-copy from an already copied-from object, see 9497.
- Added list of values for numeric_limits.
Odeint:
- Added algebra and operations dispatcher for automatic detection of appropriate algebras and operations.
- Added support for Eigen, Boost.Multiarray, Boost.Mpi, Boost.Compute, Blaze, and NT2.
- Changed algebra interface to use algebra.norm_inf function.
- Added iterators for iterating through the solution of the ODEs, hence an alternative to the integrate functions.
- Added the Velocity-Verlet method.
- Minor bug fixes.
Optional:
- Added support for rvalue references. Now optional<T> works with moveable but non-copyable T's.
- Improved swap (now uses move operations).
- Added function emplace(). This is the last of the requests from #1841.
- optional is moveable, including conditional noexcept specifications, which make it move_if_noexcept-friendly.
- Using explicit operator bool() on platforms that support it (#4227) (breaking change).
- Forward declaration of operator<<(ostream&, optional const&) to prevent inadvertent incorrect serialization of optional objects.
- Removed depprecated function reset() from examples (#9005).
- Equality comparison with boost::none does not require that T be EqualityComparable.
- Optional rvalue references are explicitly disallowed.
- Binding temporaries to optional references is explicitly disallowed (breaking change).
- More ways to access the contained value, functions value(), value_or(), value_or_eval().
- Updated and reorganized documentation, added tutorial and quick guide sections.
Predef:
- Addition of BOOST_PLAT_* platform definitions for MinGW and Windows platform variants.
- Detection of ARM architecture for Windows compilers to target mobile devices of Windows 8.
- Improved ARM detection for 64 bit ARM.
- Added detection of iOS as an operating system.
- Improved detection of endianess on some platforms.
- Addition of exclusive plus emulated definitions for platform and compiler detection.
Preprocessor:
- When using variadic macros tuple functionality was added to match all the array functionality.
Program Options:
- Columns in the --help output are now aligned across all option groups (#6114).
- Option names with dashes are no longer truncated in error messages (#8009).
Regex:
- Breaking change: corrected behavior of basic_regex<>::mark_count() to match existing documentation, basic_regex<>::subexpression(n) changed to match, see #9227
- Fixed issue #8903.
- Fixed documentation typos from #9283.
- Fixed bug in collation code that failed if the locale generated collation strings with embedded nul's, see #9451.
- Apply patch for unusual thread usage (no statically initiallized mutexes), see #9461.
- Added better checks for invalid UTF-8 sequences, see #9473.
Smart Pointers:
- Updated the overloads of make_shared and allocate_shared of array types (T[] or T[N]) to conform to the specification in C++ standard paper N3939 and significantly reduced the spatial overhead of the internal bookkeeping structures.
- Updated the implementations of make_shared and allocate_shared for scalar types and array types, respectively, to resolve C++ standard library defect report #2070.
Thread:
- New Experimental Features:
  - #7446 Async: Add when_any.
  - #7447 Async: Add when_all.
  - #7448 Async: Add async taking a scheduler parameter.
  - #8274 Synchro: Add concurrent queue
  - #8513 Async: Add a basic thread_pool executor.
  - #8518 Synchro: Add a latch class.
  - #8516 Async: Add future/shared_future::then taking a scheduler as parameter.
  - #9058 with_lock_guard function
  - #9571 Add a dynamic executor and an executor adaptor
- Fixed Bugs:
  - #8070 prefer GetTickCount64 over GetTickCount
  - #9333 ex_scoped_thread compile fails on msvc-12.0
  - #9341 compile error scoped_thread(move semantics) intel-linux-14.0.1
  - #9366 async(Executor, ...) fails to compile with msvc-10,11,12
  - #9402 test_excutor regression on msvc-10,11,12
  - #9404 ex_make_future regression error
  - #9471 Synchronization documentation nits
  - #9535 Missing exception safety might result in crash
  - #9618 try_join_for problem: program is not terminate.
  - #9625 Please rewrite boost::thread::~thread() reference section
  - #9632 public method start_thread in boost::thread class
  - #9673 thread compilation with MingW/gcc on Windows gives errors
  - #9708 boost::condition_variable::timed_wait unexpectedly wakes up while should wait infinite
  - #9711 future continuation called twice
  - #9867 Remove references to gcc-mingw
  - #10008 Boost Synchronization documentation typos (futures)
  - #10058 Null pointer access in once
  - #10125 call_once: compile errors in variadic version with rvalue reference emulation
  - #10126 call_once: deprecate (Function, once_flag&) overload
  - #10147 pthread_delay_np() parameters different on AIX even with gcc
  - #10155 thread::physical_concurrency() always returns 0 on PowerPC
  - #10184 Future: multiply defined symbols
TR1:
- This library is now deprecated.
TTI:
- Ticket #9441: Added better support for Sun Solaris Studio C++ compiler.
- Ticket #9444: Handle all situations where the enclosing class is not a class type.
Unordered:
- Minor documentation and warning fixes (#9377, #9719).
- Always use prime number of buckets for integers. Fixes performance regression when inserting consecutive integers (#9282).
- Only construct elements using allocators, as specified in C++11 standard.
Utility:
- Some components were moved to the new Boost.Core library.
- empty_deleter is deprecated in favor of null_deleter from Boost.Core. empty_deleter is an alias for null_deleter, it will be removed in future releases.
- base_from_member utility now supports lvalue reference member types. (#7577)
UUID:
- Added basic support for C++11 features.
- Implemented SSE-optimized versions of some functions of uuid, including comparison operators and swap. The support for different versions of SSE is automatically detected at compile time for most compilers, but can also be explicitly enabled or disabled with configuration macros. (#8509)
- Silenced some compiler warnings. (#8495, #8697)
Variant:
- Breaking change: Variant now uses variadic templates if they are supported by compiler. This leads to smaller binaries and better compilation times but in some cases may break metaprogramming functions, especially if BOOST_VARIANT_ENUM_PARAMS and BOOST_VARIANT_ENUM_SHIFTED_PARAMS are not used. Usage of variadic templates may be disabled.
- Added polymorphic_get function #9479.
- Move-only classes now can be returned by visitors.
- Optimized variant::swap() and fixed ambiguity in move_swap #2839.
- Added conditional noexcepts to move assignments, default and move constructors making boost::variant move_if_noexcept-friendly (#7911).
- Exceptions are now visible across modules even with -fvisibility=hidden flags.
- Dropped support of antique compilers.
- Fixed some warnings (#3020).

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.3, 3.2, 3.1, 3.0
- Clang, C++98: 3.3.16
- Clang, C++11, libc++: 3.4.2
- Clang, C++1y: 3.3.16
- GCC: 4.8.2, 4.8.1, 4.7.3, 4.6.4, 4.4.7
- GCC, C++98: 4.9.0
- GCC, C++11: 4.8.2
- GCC, C++1y: 4.9.0
- Intel: 13.1
OS X:
- Apple Clang: 5.1
- Apple Clang, C++11: 5.1
- GCC: 4.2.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.9.0, 4.8.2, 4.7.3, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 12.0, 11.0, 10.0, 9.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Boost's additional test compilers include:

Linux:
- Clang: 3.4, 3.3, 3.2, 3.1, 3.0
- Clang, C++98: 3.3.16
- Clang, C++11, libc++: 3.4.2
- Clang, C++1y: 3.3.16
- Clang, C++14, libc++: trunk
- GCC: 4.8.2, 4.8.1, 4.7.3, 4.6.4, 4.4.7
- GCC, C++98: 4.9.0
- GCC, C++11: 4.9.0, 4.8.2
- GCC, C++1y: 4.9.0
- Intel: 13.1, 13.0, 12.1, 11.1
OS X:
- Apple Clang: 5.1
- Apple Clang, C++11:
- Clang: trunk
- Clang, C++11: trunk
- GCC: 4.2.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.9.0, 4.8.2, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 12.0, 11.0, 10.0, 9.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC, ARM: 4.4.2
- QCC, x86: 4.4.2

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.55.0

Mon, 11 Nov 2013 11:50:20 -0800

Other Downloads

Windows binaries
PDF documentation (only for BoostBook based documentation).

News

Support was removed from Config for some very old versions of compilers. The new minimum requirements are:

Digitial Mars 8.41
GCC 3.3
Intel 6.0
Visual C++ 7.1

Note: This is just the mininimum requirements for Config. Some Boost libraries may have higher mininimum requirements and not support all platforms or compilers.

Other compilers are currently unchanged, but we are considering removing support for some other old compilers. Candidates for removal are:

Metroworks C++ (i.e. codewarrior)
SunPro 5.7 and earlier
Borland C++ Builder 2006 (5.82) and earlier

If you're using any of these, please let us know on the mailing lists. We will take into account any feedback received before making a decision.

Known Bugs with Visual Studio 2013/Visual C++ 12

Visual Studio 2013 was released quite late in the release process, so there exist several unresolved issues. These include:

Serialization can't compile because of a missing include.
Using has_member_function_callable_with from Boost.Container's allocator_traits causes a compile error (#9332).
In libraries such as Unordered and MultiIndex, calling overloaded functions with initializer lists can result in a compile error, with Visual C++ claiming that the overloads are ambiguous. This is a Visual C++ bug and it isn't clear if there's a good workaround. This won't affect code that doesn't use initializer lists, or uses an initializer list that doesn't require an implicit conversion (i.e. an initializer list of the container's exact value type).
Thread: ex_scoped_thread compile fails (#9333).

Patches

Log patch: fixes incorrect output of the dump manipulator, when used on AVX2-enabled CPU (e.g. Intel Haswell).

New Libraries

Predef: This library defines a set of compiler, architecture, operating system, library, and other version numbers from the information it can gather of C, C++, Objective C, and Objective C++ predefined macros or those defined in generally available headers, from Rene Rivera.

Updated Libraries

Accumulators:
- #7915 Fix silly typos.
- #8850 Fix MSVC warnings.
- #8262 Rename average to fdiv.
Any:
- boost::bad_any_cast exception is now visible across modules #8751.
- Added clear() member function.
- Added missing BOOST_NOEXCEPT.
- Fixed issue with const rvalues #9215.
Asio:
- Implemented a limited port to Windows Runtime. This support requires that the language extensions be enabled. Due to the restricted facilities exposed by the Windows Runtime API, the port also comes with the following caveats:
  - The core facilities such as the io_service, strand, buffers, composed operations, timers, etc., should all work as normal.
  - For sockets, only client-side TCP is supported.
  - Explicit binding of a client-side TCP socket is not supported.
  - The cancel() function is not supported for sockets. Asynchronous operations may only be cancelled by closing the socket.
  - Operations that use null_buffers are not supported.
  - Only tcp::no_delay and socket_base::keep_alive options are supported.
  - Resolvers do not support service names, only numbers. I.e. you must use "80" rather than "http".
  - Most resolver query flags have no effect.
- Fixed a regression (introduced in Boost 1.54) where, on some platforms, errors from async_connect were not correctly propagated through to the completion handler (#8795).
- Fixed a Windows-specific regression (introduced in Boost 1.54) that occurs when multiple threads are running an io_service. When the bug occurs, the result of an asynchronous operation (error and bytes transferred) is incorrectly discarded and zero values used instead. For TCP sockets this results in spurious end-of-file notifications (#8933).
- Fixed a bug in handler tracking, where it was not correctly printing out some handler IDs (#8808).
- Fixed the comparison used to test for successful synchronous accept operations so that it works correctly with unsigned socket descriptors (#8752).
- Ensured the signal number is correctly passed to the completion handler when starting an async_wait on a signal that is already raised (#8738).
- Suppressed a g++ 4.8+ warning about unused typedefs (#8980).
- Enabled the move optimisation for handlers that use the default invocation hook (#8624).
- Clarified that programs must not issue overlapping async_write_at operations (#8669).
- Changed the Windows HANDLE backend to treat ERROR_MORE_DATA as a non-fatal error when returned by GetOverlappedResult for a synchronous read (#8722).
- Visual C++ language extensions use generic as a keyword. Added a workaround that renames the namespace to cpp_generic when those language extensions are in effect.
- Fixed some asynchronous operations that missed out on getting async_result support in Boost 1.54. In particular, the buffered stream templates have been updated so that they adhere to current handler patterns (#9000, #9001).
- Enabled move support for Microsoft Visual Studio 2012 (#8959).
- Added use_future support for Microsoft Visual Studio 2012.
- Removed a use of std::min in the Windows IOCP backend to avoid a dependency on the <algorithm> header (#8758).
- Eliminated some unnecessary handler copies.
- Fixed various minor and cosmetic issues in code and documentation (including #8347, #8950, #8953, #8965, #8997).
Atomic:
- Added support for 64-bit atomic operations on x86 target for GCC, MSVC and compatible compilers. The support is enabled when it is known at compile time that the target CPU supports required instructions.
- Added support for 128-bit atomic operations on x86-64 target for GCC and compatible compilers. The support is enabled when it is known at compile time that the target CPU supports required instructions. The support can be tested for with the new BOOST_ATOMIC_INT128_LOCK_FREE macro.
- Added a more efficient implementation of atomic<> based on GCC __atomic* intrinsics available since GCC 4.7.
- Added support for more ARM v7 CPUs, improved detection of Thumb 2.
- Added support for x32 (i.e. 64-bit x86 with 32-bit pointers) target on GCC and compatible compilers.
- Removed dependency on Boost.Thread.
- Internal lock pool now includes proper padding and alignment to avoid false sharing.
- Fixed compilation with Intel compiler on Windows. Removed internal macro duplication when compiled on Windows.
- Some code refactoring to use C++11 features when available.
Chrono:
- Fixed Bugs:
  - #7868 chrono_io parses time incorrectly (1.53 and 1.52)
  - #9028 Typo in boost/chrono/stopwatches/formatters/base_formatter.hpp
  - #9147 uninitialized std::tm
Circular Buffer:
- Added support for rvalue references and rvalue references emulation using Boost.Move. Values are moved only if value type has noexcept move constructor and noexcept move assignment operator #7888. Now Circular Buffer is usable with move-only types.
- Much better documentation.
- #5362 circular_buffer does not compile with BOOST_NO_EXCEPTIONS.
- #7025 circular buffer reports warning: " type qualifiers ignored on function return type" while compile.
- #7950 Eliminate W4-warnings under VS2005 - warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used.
Config:
- Breaking change: Removed support for some older compilers. The new minimum compiler versions are:
  - Digitial Mars 8.41
  - GCC 3.3
  - Intel 6.0
  - Visual C++ 7.1
  Other compilers are unchanged.
Container:
- Implemented SCARY iterators.
- Fixed bugs #8269, #8473, #8892, #9009, #9064, #9092, #9108.
Context:
- #8650 SSE2 intrinsics
Coroutine:
- New interface (unidirectional data transfer).
- #8782 no best alternative
- #8801 auto-linking
Filesystem:
- Fixed Android compilation #8706.
Fusion:
- #8759 specialization of convert_impl for map_tag
Geometry:
- Additional functionality
  - Added centroid for segment type
  - Added intersects() and disjoints() for Segment-Box and Linestring-Box
  - Added rtree creation using packing algorithm
  - Added contains() and covers() spatial query predicates
  - Added iterative queries
- Bugfixes
  - In some cases .back() or .clear() was called, violating the usage of Concepts. Fixed for the reported cases
- Solved tickets
  - 6958 Intersection generates self-intersection. Caused by spike, fixed
  - 8364 Invalid input exception, caused by spikes in previous steps, fixed
  - 8365 Invalid input exception, caused by spikes in previous steps, fixed
  - 8969 boost::geometry::model::point single argument constructor should be explicit
  - 8825 Patch adding member variable documentation to doxygen_xml2qbk
  - 8652 Intersection fails for triangle-triangle intersection. Caused by spike, fixed
  - 9047 Boost files that include themselves (strategies/intersection.hpp), fixed
Graph:
- void is no longer allowed as a bundled property type (for example, in the VertexProperties template parameters to graph types); it did not work reliably before, but a static assertion now forbids it entirely. Use boost::no_property instead.
- Added support for finish_edge visitor event point in depth-first search; the change should be backward-compatible with visitors that do not have that member function.
- Disabled building of tests on Sun compiler.
- Multiple source vertices are supported in non-named-parameter versions of breadth_first_visit, breadth_first_search, dijkstra_shortest_paths, and dijkstra_shortest_paths_no_init. This feature is not yet documented; to use it, replace the single parameter for the source vertex in each of these functions by two input iterators of the same type containing the source vertices to use.
- Added Hawick circuits algorithm; contributed by Louis Dionne.
- Added edge coloring algorithm; contributed by Maciej Piechotka.
- Added min-cost max-flow algorithm; contributed by Piotr Wygocki.
- Bugs and feature requests from Trac fixed: #5269, #8317, #8433, #8791, #8877, #8986, #9012, #9080.
Hash:
- Simplify a SFINAE check so that it will hopefully work on Sun 5.9 (#8822).
- Suppress Visual C++ infinite loop warning (#8568).
Interprocess:
- Fixed bugs #7156, #7164, #8277, #8976, #9065, #9073, #9008.
Intrusive:
- Source breaking: Deprecated xxx_dont_splay functions from splay containers. Deprecated splay_set_hook from splay containers, use bs_set_hook instead. Both will be removed in Boost 1.56.
- ABI breaking: Hash containers' end iterator was implemented pointing to one-past the end of the bucket array (see #8698) causing severe bugs when values to be inserted where allocated next to the bucket array. End iterator implementation was changed to point to the beginning of the bucket array.
- Big refactoring in order to reduce template and debug symbol bloat. Test object files have been slashed to half in MSVC compilers in Debug mode. Toolchains without Identical COMDAT Folding (ICF) should notice size improvements.
- Implemented SCARY iterators.
Lexical cast:
- std::bad_alloc exceptions are now are not converted to boost::bad_lexical_cast #8966.
- Added static assert that checks for std::numeric_limits specializations if they are required for conversion. Use BOOST_HAS_INT128 for detecting 128 bit integers support #8790.
- Documentation improved and more usage examples added.
Log:
- General changes:
  - Added a new configuration macro BOOST_LOG_WITHOUT_DEFAULT_FACTORIES. By defining this macro the user can disable compilation of the default filter and formatter factories used by settings parsers. This can substantially reduce binary sizes while still retaining support for settings parsers.
  - Rewritten some of the parsers to reduce the compiled binary size. The rewritten parsers are more robust in detecting ambiguous and incorrect input.
  - The following headers are deprecated: boost/log/utility/intrusive_ref_counter.hpp, boost/log/utility/explicit_operator_bool.hpp, boost/log/utility/empty_deleter.hpp. These headers will be removed in future releases. The contents of these headers were moved to other libraries.
- Bug fixes:
  - Fixed timer attribute generating incorrect time readings on Windows on heavy thread contention when QueryPerformanceCounter API was used.
  - Fixed a bug in the filter parser that prevented using parsed filters with some attributes.
  - Fixed thread id formatting discrepancies between the default sink and formatters.
  - Closed tickets: #8815, #8819, #8915, #8917, #9139, #9140, #9153, #9155.
- See changelog for more details.
Math:
- Suppress numerous warnings (mostly from GCC-4.8 and MSVC) #8384, #8855, #9107, #9109..
- Fixed PGI compilation issue #8333.
- Fixed PGI constant value initialization issue that caused erf to generate incorrect results #8621.
- Prevent macro expansion of some C99 macros that are also C++ functions #8732 and #8733..
- Fixed Student's T distribution to behave correctly with huge degrees of freedom (larger than the largest representable integer) #8837.
- Make some core functions usable with long double even when the platform has no standard library long double support #8940.
- Fix error handling of distributions to catch invalid scale and location parameters when the random variable is infinite #9042 and #9126.
- Add workaround for broken <tuple> in Intel C++ 14 #9087.
- Improve consistency of argument reduction in the elliptic integrals #9104.
- Fix bug in inverse incomplete beta that results in cancellation errors when the beta function is really an arcsine or Student's T distribution.
- Fix issue in Bessel I and K function continued fractions that causes spurious over/underflow.
- Add improvement to non-central chi squared distribution quantile due to Thomas Luu.
Move:
- Fixed bugs #7952, #8764, #8765, #8842, #8979.
Meta State Machine:
- New feature: interrupt states now support a sequence of events to end the interruption.
- Fixed Trac #8686.
Multiprecision:
- Added support for Boost.Serialization.
- Suppressed some GCC warnings. See 8872.
- Fixed bug in pow for large integer arguments. See 8809.
- Fixed bug in pow for calculation of 0[super N]. See 8798.
- Fixed bug in fixed precision cpp_int IO code that causes conversion to string to fail when the bit count is very small (less than CHAR_BIT). See 8745.
- Fixed bug in cpp_int that causes left shift to fail when a fixed precision type would overflow. See 8741.
- Fixed some cosmetic warnings from cpp_int. See 8748.
- Fixed calls to functions which are required to be macros in C99. See 8732.
- Fixed bug that causes construction from INT_MIN, LONG_MIN etc to fail in cpp_int. See 8711.
Multi-index Containers:
- Boost.MultiIndex has been brought to a higher level of compliance with C++11.
  - multi_index_container is now efficiently movable.
  - Initializer lists supported.
  - Emplace functions provided.
  - Non-copyable elements (such as std::unique_ptr<T>) supported. This includes insertion of a range [first,last) where the iterators point to a type that is convertible to that of the element: no copy construction happens in the process.
  - Random access indices provide shrink_to_fit().
  Refer to the compiler specifics section for limitations on pre-C++11 compilers.
- The following classes are deprecated:
- Maintenance fixes.
MPI:
- Replaced calls to deprecated MPI functions
- Added support for multi-threaded initialization
- Added in-place collectives
Phoenix:
- #9049 phoenix::function constructor is constexpr.
Polygon:
- Updated CGAL part of the Voronoi benchmark with patches from Sebastien Loriot. Updated documentation.
- Added polygon decomposition capability to polygon_90_set_data container (patch from Intel). Updated documentation.
- Bugs fixed from Trac: #8197.
PropertyMap:
- dynamic_properties objects can now be built by non-destructively chaining .property(name, pm) calls. Example:
```
boost::dynamic_properties()
  .property("color", color_map)
  .property("pos", position_map)
```
- The use of raw pointers as property maps is deprecated; it often failed on Visual Studio in the past. This usage has been removed from all tests and examples in Boost.Graph. The replacement to use for vertex properties in graphs (the most common use for this feature) is:
```
boost::make_iterator_property_map(
  <pointer or container .begin() iterator>,
  get(boost::vertex_index, <graph object>))
```
  (Note: the lack of namespace qualification on get() in this code is necessary for generic code). Outside a graph context, the closest equivalent is:
```
boost::make_iterator_property_map(
  <pointer>,
  boost::typed_identity_property_map<std::size_t>())
```
  There are commented-out static assertions on lines 151 and 159 of <boost/property_map/property_map.hpp> that can be un-commented to find deprecated uses of pointers in user code.
Rational:
- Added lowest and max_digits10, members of std::numeric_limits added in C++11, to the unit-test code. Needed since Boost.Test refers to one of them when compiled in C++11 mode.
- Changed initialization of some internal variables to something that cannot be a narrowing conversion, which fixes issue #5855. Needed since narrowing conversions are an error in C++11.
SmartPtr:
- Added boost/smart_ptr/intrusive_ref_counter.hpp header, extracted from Boost.Log. The header implements a mixin base class that adds support for intrusive_ptr to user's classes.
Thread:
- New Features:
  - #8519 Synchro: Update class barrier with a completion function.
  - #8515 Async: Add shared_future::then.
  - #8519 Synchro: Update class barrier with a completion function
  - #8615 Async: Replace make_future/make_shared_future by make_ready_future.
  - #8627 Async: Add future<>::unwrap and unwrapping constructor.
  - #8677 Async: Add future<>::get_or.
  - #8678 Async: Add future<>::fallback_to.
  - #8891 upgrade_to_unique_lock: missing mutex() function.
  - #8955 Request for more efficient way to get exception_ptr from future.
- Fixed Bugs:
  - #7461 detail::win32::ReleaseSemaphore may be called with count_to_release equal to 0
  - #8070 prefer GetTickCount64 over GetTickCount
  - #8768 win32 condition_variable::wait_until infinite wait in rare cases.
  - #8817 Boost Thread Windows CE _createthreadex handling breaks mingw w64.
  - #8943 Failed to compile code using boost::call_once with Intel C++ Composer XE 2013 on Windows.
  - #8931 Typos in external_locking reference.
  - #9029 Misprint in documentation.
  - #9037 gcc -Wshadow gives warnings in condition_variable{,_fwd}.hpp.
  - #9041 Boost.Thread DSO's may need to link with Boost.Atomic.
  - #9048 boost::scoped_thread useless ctor with variadic template arguments.
  - #9079 Condition variable will wait forever for some timepoint values (Win).
Timer:
- Fixed compilation on Intel compiler #8956.
Type Traits:
- Added is_copy_contructible trait #8802.
Unordered:
- Avoid some warnings (#8851, #8874).
- Avoid exposing some detail functions via. ADL on the iterators.
- Work around variadic parameter bug in Visual Studio 2013. The compiler still has problems with initializer lists, but it might not be possible to work around those.
Utility:
- boost::result_of can be set to use TR1 protocol by default and fall back to decltype if the function object does not support it (like C++11 lambda functions, for example). Define BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK configuration macro to enable this mode.
- Improved support for C++11 in the boost::base_from_member class template. The class implements perfect forwarding for the constructor arguments, if the compiler supports rvalue references, variadic templates and function template default arguments.
- Added boost/utility/explicit_operator_bool.hpp and boost/utility/empty_deleter.hpp headers, which were extracted from Boost.Log. The headers implement utilities for defining explicit conversion operators to bool and a deleter function object that does nothing, respectively.
Variant:
- Fixed compilation of constructor and assignment operator with const rvalues input parameters #8988.
- Fixed compilation of move assignment operator for situations when one of the variant template classes has nothrow copy constructor and throwing move constructor #8772.
- Fix compilation on exception-disabled environments #8717.
- Fix unreachable code warnings #8665.
- Removed duplicate code #7601.
Wave:
- See the Changelog for details.
xpressive:
- #8843 throw instead of assert at incomplete charset
- #8880 remove unused local typedef
- #8882 use RAII instead of try/catch in sequence_stack.hpp
- #8474 make xpressive play nice with clang's -Wimplicit-fallthrough diagnostic

Updated Tools

Quickbook:
- Quickbook 1.6 finalized, see the Quickbook documentation for details.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.3, 3.2, 3.1, 3.0
- Clang, C++11, libc++: 3.4, 3.3
- GCC: 4.8.1, 4.7.3, 4.6.3, 4.5.3, 4.4.7
- GCC, C++11: 4.8.1
- GCC, C++98: 4.8.1
OS X:
- GCC: 4.2
- Apple Clang: 5.0
- Apple Clang, C++11: 5.0
Windows:
- GCC, mingw: 4.8.0, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 11.0, 10.0, 9.0

Boost's additional test compilers include:

OS X:
- Apple Clang: 5.0
- Apple Clang, C++11: 5.0
- Clang: trunk
- Clang, C++11: trunk
- GCC: 4.2.1
Linux:
- Clang: 3.3, 3.2, 3.1, 3.0, trunk
- Clang, C++11: 3.4
- Clang, C++11, libc++: 3.4, 3.3
- GCC: 4.9.0 (experimental), 4.8.1, 4.7.3, 4.6.4, 4.5.3, 4.4.7
- GCC, C++11: 4.8.1
- GCC, C++98: 4.8.1
- Intel: 13.0.1, 12.1.6
Windows:
- GCC, mingw: 4.8.0, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 11.0, 10.0, 9.0

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.54.0

Mon, 1 Jul 2013 10:10:02 -0700

Patches

These are patches from library authors which were found too late to be fixed in the 1.54.0 release. Be careful as they have not been through the normal testing process.

News

Supported CPUs

Boost no longer supports the 80386 target CPU, the minimum x86 32-bit target is i486. The 80386 target was not properly supported by Boost.SmartPtr and Boost.Atomic (as well as the libraries that used them internally) even before this release. Some Boost libraries may have higher requirements on the minimum target CPU (like Boost.Log for example), see the respective library documentation for details.

Also by default, when building Boost for x86 32-bit targets it will compile for i686 (Pentium Pro) and later CPUs. This can be changed by specifying the instruction-set property in b2 or bjam command line, for example:

b2 variant=release architecture=x86 instruction-set=i486 stage

Possible values for the instruction-set are:

Target for the host CPU: native
Generic x86 CPUs: i486, i586, i686
Intel CPUs: pentium, pentium-mmx, pentiumpro, pentium2, pentium3, pentium3m, pentium-m, pentium4, pentium4m, prescott, nocona, core2, corei7, corei7-avx, core-avx-i, conroe, conroe-xe, conroe-l, allendale, merom, merom-xe, kentsfield, kentsfield-xe, penryn, wolfdale, yorksfield, nehalem, sandy-bridge, ivy-bridge, haswell, atom
AMD CPUs: k6, k6-2, k6-3, athlon, athlon-tbird, athlon-4, athlon-xp, athlon-mp, k8, opteron, athlon64, athlon-fx, k8-sse3, opteron-sse3, athlon64-sse3, amdfam10, barcelona, bdver1, bdver2, bdver3, btver1, btver2
VIA CPUs: c3, c3-2
IDT CPUs: winchip-c6, winchip2

Note that not all these values may be supported by a particular compiler.

Signals deprecated

Boost.Signals is no longer being actively maintained, so it has been deprecated. Do not use Boost.Signals for new development (use Boost.Signals2 instead). If you have existing Boost.Signals-based code, it will continue to work, but consider moving to Boost.Signals2. There is a porting guide in the Signals2 documentation.

New Libraries

Log: Logging library, from Andrey Semashev.
TTI: Type Traits Introspection library, from Edward Diener.
Type Erasure: Runtime polymorphism based on concepts.

Updated Libraries

Accumulators:
- Fixes comment typos (#7917)
- Silence unused variable warnings (#6926)
Algorithm:
- The return types for copy_while and copy_until have been changed. This is an interface change. If you were using the return values from these functions, then you will have to modify your code. Instead of just returning the modified OutputIterator, these functions now return a std::pair<InputIterator, OutputIterator>. If this change affects your code, the simplest change is to add a .second to the end of the call, which will get you the same behavior that you had before.
- Added C++14 versions of 'is_permutation', 'equal' and 'mismatch'.
Any:
- Added C++11 features support #6999:
  - Move assignment and move constructors.
  - Added noexcept modifiers.
Asio:
- Added new traits classes, handler_type and async_result, that allow the customisation of the return type of an initiating function.
- Added the asio::spawn() function, a high-level wrapper for running stackful coroutines, based on the Boost.Coroutine library. The spawn() function enables programs to implement asynchronous logic in a synchronous manner. For example: size_t n = my_socket.async_read_some(my_buffer, yield);.
- Added the asio::use_future special value, which provides first-class support for returning a C++11 std::future from an asynchronous operation's initiating function. For example: future<size_t> n = my_socket.async_read_some(my_buffer, asio::use_future);.
- Promoted the stackless coroutine class and macros to be part of Asio's documented interface, rather than part of the HTTP server 4 example.
- Added a new handler hook called asio_handler_is_continuation. Asynchronous operations may represent a continuation of the asynchronous control flow associated with the current executing handler. The asio_handler_is_continuation hook can be customised to return true if this is the case, and Asio's implementation can use this knowledge to optimise scheduling of the new handler. To cover common cases, Asio customises the hook for strands, spawn() and composed asynchronous operations.
- Added four new generic protocol classes, generic::datagram_protocol, generic::raw_protocol, generic::seq_packet_protocol and generic::stream_protocol, which implement the Protocol type requirements, but allow the user to specify the address family (e.g. AF_INET) and protocol type (e.g. IPPROTO_TCP) at runtime.
- Added C++11 move constructors that allow the conversion of a socket (or acceptor) into a more generic type. For example, an ip::tcp::socket can be converted into a generic::stream_protocol::socket via move construction.
- Extended the basic_socket_acceptor<> class's accept() and async_accept() functions to allow a new connection to be accepted directly into a socket of a more generic type. For example, an ip::tcp::acceptor can be used to accept into a generic::stream_protocol::socket object.
- Moved existing examples into a C++03-specific directory, and added a new directory for C++11-specific examples. A limited subset of the C++03 examples have been converted to their C++11 equivalents.
- Various SSL enhancements. Thanks go to Nick Jones, on whose work these changes are based.
  - Added support for SSL handshakes with re-use of data already read from the wire. New overloads of the ssl::stream<> class's handshake() and async_handshake() functions have been added. These accept a ConstBufferSequence to be used as initial input to the ssl engine for the handshake procedure.
  - Added support for creation of TLSv1.1 and TLSv1.2 ssl::context objects.
  - Added a set_verify_depth() function to the ssl::context and ssl::stream<> classes.
  - Added the ability to load SSL certificate and key data from memory buffers. New functions, add_certificate_authority(), use_certificate(), use_certificate_chain(), use_private_key(), use_rsa_private_key() and use_tmp_dh(), have been added to the ssl::context class.
  - Changed ssl::context to automatically disable SSL compression by default. To enable, use the new ssl::context::clear_options() function, as in my_context.clear_options(ssl::context::no_compression).
- Fixed a potential deadlock in signal_set implementation.
- Fixed an error in acceptor example in documentation #8421.
- Fixed copy-paste errors in waitable timer documentation #8602.
- Added assertions to satisfy some code analysis tools #7739.
- Fixed a malformed #warning directive #7939.
- Fixed a potential data race in the Linux epoll implementation.
- Fixed a Windows-specific bug, where certain operations might generate an error_code with an invalid (i.e. NULL) error_category #8613.
- Fixed basic_waitable_timer's underlying implementation so that it can handle any time_point value without overflowing the intermediate duration objects.
- Fixed a problem with lost thread wakeups that can occur when making concurrent calls to run() and poll() on the same io_service object #8354.
- Fixed implementation of asynchronous connect operation so that it can cope with spurious readiness notifications from the reactor #7961.
Chrono:
- Fixed Bugs:
  - #8079 Chrono memory leak
  - #8318 BOOST_FORCEINLINE constructors of time_point and duration
  - #8367 chrono does not compile with clang from XCode 4.5.2 with -std=c++11 -stdlib=libc++ and -arch armv7
  - #8370 typo in chrono reference
  - #8435 Can't compile Chrono on HP-UX due to no CLOCK_REALTIME macro.
Circular Buffer:
- Fixed warnings (#8032).
Container:
- Added experimental static_vector class, based on Andrew Hundt's and Adam Wulkiewicz's high-performance varray class.
- Speed improvements in vector constructors/copy/move/swap, dispatching to memcpy when possible.
- Support for BOOST_NO_EXCEPTIONS #7227.
- Fixed bugs #7921, #7969, #8118, #8294, #8553.
Context:
- Support for SPARC architecture added.
Coroutine:
- Support for segmented stacks (stack grows on demand) added.
- #7805 Typo
- #7972 GCC warnings
- #7988 C++11 range-for
- #8023 Using iterator traits
- #8024 Create const_iterator
- #8101 Postfix operator++ for iterator
- #8526 memory leak
- #8544 calling managed DLL
Geometry:
- Additional functionality
  - added Spatial Index, developed for Boost.Geometry by Adam Wulkiewicz. The spatial index was originally started by Federico J. Fernandez during the Google Summer of Code 2008 program, mentored by Hartmut Kaiser.
  - added SVG-output, this was already in extensions for several years
- Documentation
  - small fixes of missing words
- Bugfixes
  - collinear opposite segments did sometimes (in circles) have a robustness issue, fixed
  - fixed insertion of false intersection point (found by buffer)
  - applied patch of Vladimir Petrovic for debugging traversals
- Solved tickets
  - 7462 degenerate union result for float, fixed
  - 7465 wrong construtors access type in scale_transformer class, fixed
  - 7802 cart_intersect.hpp unused parameter warnings, fixed
  - 8254 faulty intersection, fixed
  - 8393 polygon model doesn't adhere to stated Polygon concept rules, doc updated.
  - 8403 silenced compiler warning C4127: conditional expression is constant
  - 8405 silenced compiler warning C4189: '...' : local variable is initialized but not referenced
- Internal changes
  - Made several algorithms variant-aware (append, area, clear, convert, equals, length, num_points)
Graph:
- Bugs fixed from Trac: #6780, #7016, #7155, #7845, #7863, #7877, #8166, #8192, #8398, #8411, #8427, #8428, #8434, #8490, #8681.
- Added updates to VF2 subgraph isomorphism from Jakob Lykke Andersen and Flavio De Lorenzi.
- Added maximum adjacency search from Fernando Vilas.
- Added timeout support from Brammert Ottens to resource-constrained shortest paths (r_c_shortest_paths) algorithm.
- Various fixes to documentation and examples and removal of outdated compiler workarounds.
Interprocess:
- Added support for platform-specific flags to mapped_region (ticket #8030)
- Fixed bugs #7484, #7598, #7682, #7923, #7924, #7928, #7936, #8521, #8595.
- ABI breaking: Changed bootstamp function in Windows to use EventLog service start time as system bootup time. Previously used LastBootupTime from WMI was unstable with time synchronization and hibernation and unusable in practice. If you really need to obtain pre Boost 1.54 behaviour define BOOST_INTERPROCESS_BOOTSTAMP_IS_LASTBOOTUPTIME from command line or detail/workaround.hpp.
Intrusive:
- Added BOOST_NO_EXCEPTIONS support (bug #7849).
Iostreams:
- tee now works correctly for std::streams (#8315).
- Documentation fixes (#8385, #8460).
- Avoid warning from Clang's -Wimplicit-fallthrough (#8482).
Lexical cast:
- Converting to character pointer now triggers compile time assert instead of runtime #8334.
- Lexical cast is now capable of converting boost::int128_type and boost::uint128_type #7909.
- Changed internal stream buffer handling, now works with libc++ #8267, #7704.
- Restored getting address of lexical_cast function that was broken in 1.53.0 #7421.
- Fixed warnings, internals and tests #2558, #7949, #8162, #8369, #8547.
Math:
- Major reorganization to incorporate other Boost.Math like Integer Utilities (Greatest Common Divisor and Least Common Multiple), quaternions and octonions. Making new chapter headings.
- Added many references to Boost.Multiprecision and cpp_dec_float_50 as an example of a User-defined Type (UDT).
- Added Clang to list of supported compilers.
- Fixed constants to use a thread-safe cache of computed values when used at arbitrary precision.
- Added finding zeros of Bessel functions cyl_bessel_j_zero, cyl_neumann_zero, airy_ai_zeros and airy_bi_zeros(by Christopher Kormanyos).
- More accuracy improvements to the Bessel J and Y functions from Rocco Romeo.
- Fixed nasty cyclic dependency bug that caused some headers to not compile #7999.
- Fixed bug in __tgamma that caused spurious overflow for arguments between 142.5 and 143.
- Fixed bug in raise_rounding_error that caused it to return an incorrect result when throwing an exception is turned off #7905.
- Added minimal __float128 support.
- Fixed bug in edge-cases of poisson quantile #8308.
- Adjusted heuristics used in Halley iteration to cope with inverting the incomplete beta in tricky regions where the derivative is flatlining. Example is computing the quantile of the Fisher F distribution for probabilities smaller than machine epsilon. See ticket #8314.
Meta State Machine:
- Bugfix: Exit points broken for the favor_compile_time policy.
- Bugfix: copy breaks exit points of subsubmachines.
- Bugfix: #8046
Move:
- Fixed bugs #7969), #8231).
Multiprecision:
- Breaking change renamed rational_adapter to rational_adaptor.
- Add support for MPFI.
- Add logged_adaptor.
- Add support for 128-bit floats via GCC's __float128 or Intel's _Quad data types.
- Add support for user-defined literals in cpp_int, improve constexpr support.
- Fixed bug in integer division of cpp_int that results in incorrect sign of cpp_int when both arguments are small enough to fit in a double_limb_type. See 8126.
- Fixed bug in subtraction of a single limb in cpp_int that results in incorrect value when the result should have a 0 in the last limb: 8133.
- Fixed bug in cpp_int where division of 0 by something doesn't get zero in the result: 8160.
- Fixed bug in some transcendental functions that caused incorrect return values when variables are reused, for example with a = pow(a, b). See 8326.
Polygon:
- Updates and fixes to the Voronoi documentation.
- Bugs fixed from Trac: #8026, #8197, #8257.
PropertyMap:
- Added compose_property_map from Guillaume Pinot.
Range:
- Bug fixes:
  - #6944 Some Range concepts use the incorrect Iterator concept
  - #7407 istream_range does not compile with wcin
  - #7408 istream_range should not pull istream
  - #7731 irange doesn't end iteration properly when step_size is 3 or more
  - #7827 [range] cant compile r | indexed to range algorithm
  - #8338 Iterator range does not work with pointer to array as iterator
  - #8453 Incorrect configuration macro BOOST_NO_PARTIAL_TEMPLATE_SPECIALIZATION
Signals:
- No longer actively maintained, so it is deprecated. Use Signals2 for new development.
Thread:
- New Features:
  - #7285 C++11 compliance: Allow to pass movable arguments for call_once.
  - #7445 Async: Add future<>.then
  - #7449 Synchro: Add a synchronized value class
- Fixed Bugs:
  - #4878 MinGW 4.5.0 undefined reference to bool interruptible_wait(detail::win32::handle handle_to_wait_for,detail::t imeout target_time).
  - #4882 Win32 shared_mutex does not handle timeouts correctly.
  - #5752 boost::call_once() is unreliable on some platforms
  - #6652 Boost.Thread shared_mutex.hpp:50:99: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  - #6843 [Intel C++] Compile Errors with '#include <atomic>'
  - #6966 future boost::future_category inconsistent dll linkage
  - #7720 exception lock_error while intensive locking/unlocking of mutex
  - #7755 Thread: deadlock with shared_mutex on Windows
  - #7980 Build error: msvc-11.0 and BOOST_THREAD_DONT_USE_DATETIME
  - #7982 pthread_delay_np() parm compile error on AIX
  - #8027 thread library fails to compile with Visual Studio 2003
  - #8070 prefer GetTickCount64 over GetTickCount
  - #8136 boost::this_thread::sleep_for() sleeps longer than it should in Windows
  - #8212 Boost thread compilation error on Solaris 10
  - #8237 fix documentation for 'thread_group'
  - #8239 barrier::wait() not marked as interruption_point
  - #8323 boost::thread::try_join_for/try_join_until may block indefinitely due to a combination of problems in Boost.Thread and Boost.Chrono
  - #8337 The internal representation of "std::string(this->code()->message())" escapes, but is destroyed when it exits scope.
  - #8371 C++11 once_flag enabled when constexpr is not available
  - #8443 Header file inclusion order may cause crashes
  - #8451 Missing documented function 'boost::scoped_thread::joinable'
  - #8530 [Coverity] Unused variable thread_handle, uninitialized variable cond_mutex in thread/pthread/thread_data.hpp
  - #8596 With C++0x enabled, boost::packaged_task stores a reference to function objects, instead of a copy.
Type Traits:
- New type traits implemented #8189:
  - is_nothrow_move_constructible
  - is_nothrow_move_assignable
  - has_trivial_move_assign
  - has_trivial_move_constructor
uBLAS:
- #6511 Division by scalar should use enable_if<>
- #7297 Make the free functions 'num_columns' and 'num_rows' support the uBLAS traits system and better work with expression types
- #6010 fixed linkage problems in assignment.hpp
- updated doc
Unordered:
- Some very basic noexcept support.
Utility:
- Fix basic_string_ref::find (#8067).
- Fix string_ref's logical operators.
- Update noncopyable for C++11 (#6578).
- Fix noncopyable compiler warning when used in DLL interface (#6935).
- Fix using boost::addressof with boost::function on SolarisStudio compiler (#7079).
- Disable annoying MSVC warning about operator comma (#7663)
Variant:
- Now uses new type traits from Boost.TypeTrait to detect noexcept constructors and assignment operators #8296. This shall increase performance of boost::variant for many types in C++11.
- Multivisitation implemented #8459.
- Documentation updated to reflect C++11 features support.
Wave:
- See the Changelog for details.
xpressive:
- Remove unused variables, fixes #8039
- Avoid name clash with macro None in glx.h, fixes #8204
- Silence a gcc warning, fixes #8138

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.4.7, 4.5.3, 4.6.2, 4.6.3, 4.7.3
- GCC, C++98 mode: 4.7.3
- GCC, C++11 mode: 4.7.2, 4.7.3, 4.8.0
- Clang: 3.0, 3.1, 3.2
- Clang, C++11 mode: 3.2
OS X:
- GCC: 4.2
- Apple Clang: 4.2.1
- Apple Clang, C++11 mode: 4.2.1
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.2, 4.8.0
- Visual C++: 8.0, 9.0, 10.0, 11.0
FreeBSD:
- GCC: 4.2.1

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, from Subversion
- Clang, with libc++: 3.2
- GCC: 4.4.7, 4.5.3, 4.6.2, 4.6.3, 4.7.2, 4.7.3
- GCC, C++98 mode: 4.7.3
- GCC, C++11 mode: 4.7.3, 4.8.0
OS X:
- Apple Clang: 4.2.1
- Apple Clang, C++11 mode: 4.2.1
- Clang: from Subversion
- Clang, C++11 mode: from Subversion
- GCC: 4.2
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.2, 4.8.0
- Visual C++: 9.0, 10.0, 11.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
AIX:
- IBM XL C/C++ Enterprise Edition: 12.1.0.1
FreeBSD:
- GCC: 4.2.1

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.53.0

Mon, 4 Feb 2013 10:29:19 -0800

New Libraries

Atomic: C++11-style atomic<>, from Helge Bahmann, maintained by Tim Blechmann.
Coroutine: Coroutine library, from Oliver Kowalke.
Lockfree: Lockfree data structures, from Tim Blechmann.
Multiprecision: Extended precision arithmetic types for floating point, integer and rational arithmetic from John Maddock and Christopher Kormanyos.
Odeint: Solving ordinary differential equations, from Karsten Ahnert and Mario Mulansky.

News

This release contains a fix for ticket #7743, in Boost.Locale. For more details, see the security notice.

Updated Libraries

Algorithm:
- Fixed non-ASCII char in comment (#7781).
- Updated the Knuth-Morris-Pratt docs (#7656).
Array:
- Added support for boost::get and std::get (#7652)
Asio:
- Fixed some 64-to-32-bit conversion warnings (#7459).
- Fixed some small errors in documentation and comments (#7761).
- Fixed an error in the example embedded in basic_socket::get_option's documentation (#7562).
- Changed to use long rather than int for SSL_CTX options, to match OpenSSL (#7209).
- Changed to use _snwprintf to address a compile error due to the changed swprintf signature in recent versions of MinGW (#7373).
- Fixed a deadlock that can occur on Windows when shutting down a pool of io_service threads due to running out of work (#7552).
- Enabled the noexcept qualifier for error categories (#7797).
- Changed UNIX domain socket example to treat errors from accept as non-fatal (#7488).
- Added a small block recycling optimisation to improve default memory allocation behaviour.
Bimap:
- Refactor map_view_iterator to improve error messages.
- Fixed replace_(left/right/key/data) bug when using relations with info.
- Fixed vector_of and list_of views assign(size_type,value_type) bug.
- Fixed vector_of views operator[](size_type) and at(size_type) functions return value.
Chrono:
- Deprecated:
  - The chrono i/o version included in Boost.Chrono 1.2.x has been completly refactored in version 2.0.0
  - chrono I/O: The manipulators __duration_short, __duration_long are depreceated. You should use the parameterized form __duration_fmt or the renamed manipulators __duration_symbol and __duration_prefix instead.
  - chrono I/O: The __duration_punct<> facet is depreceated. You should use the __get_duration_style free function to get the informations and use the __duration_units facet for localization purposes.
  - When BOOST_CHRONO_VERSION==2 the preceding deprecated functions are not available.
- Fixes:
  - #7546 time_point<system_clock> output version 2 fails to compile
  - #7547 time_point<system_clock> input version 2 fails to compile
  - #7868 chrono_io parses time incorrectly (1.53 and 1.52)
Container:
- Fixed bug #7650.
- Improved vector's insertion performance.
- Changed again experimental multiallocation interface for better performance (still experimental).
- Added no exception support for those willing to disable exceptions in their compilers.
- Fixed GCC -Wshadow warnings.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
Context:
- Support for iOS on ARM and MacOS X on x86 (32bit) added.
- Support for SEH Overwrite Protection on Win32.
Geometry:
- Bugfixes
  - avoid generating output polygons with interior rings below minimum size (e.g. one or two points)
  - geometry::disjoint for degenerate segments (patched by Karsten Ahnert)
  - problem in geometry::difference for missing handling tangency, reported by H2
  - fixed geometry::for_each for use with Lambda's
  - fixed geometry::comparable_distance point-linestring (and -range, -polygon)
- Additional functionality
  - combinations for geometry::disjoint: point/ring, point/polygon, point/multi_polygon
  - combinations for geometry::intersects: point/ring, point/polygon, point/multi_polygon
- Internal changes
  - updates in specializations/not_implemented for various algorithms (as in an earlier version, these changes are still going on; they take care for simplified structs, better error reporting, and automatized documentation)
  - fixes in unit tests
GIL:
- Fixed self-assignment warnings (#4919).
Graph:
- Fixed the following bugs from Trac: #3468, #4386, #5269, #7428, #7457, #7467, #7600, #7648, #7684, #7728, #7741, #7766, #7771, #7773, #7780, #7787, #7801 plus other bugs not in Trac.
- Added support for reading from GraphML files containing multiple graphs.
- Added versions of A* search specifically for trees, removing the need for a color map when it is acceptable to visit the same vertex multiple times.
- Added VF2 subgraph isomorphism algorithm (contributed by Flavio De Lorenzi).
Hash:
- Add support for boost::int128_type and boost::uint128_type where available.
- On platforms that are known to have standard floating point functions, don't use the automatic detection (#7221, #7470).
Interprocess:
- Fixed GCC -Wshadow warnings.
- Experimental multiple allocation interface improved and changed again. Still unstable.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- ABI breaking: changed node pool allocators internals for improved efficiency.
- Fixed bug #7795.
Intrusive:
- Fixed bugs #7174, #7529, #7815.
- Fixed GCC -Wshadow warnings.
- Added missing explicit keyword in several intrusive container constructors.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- Small documentation fixes.
Lexical cast:
- New character type detection algorithm for user defined types #6786.
- Documentation updates (#7582, #7831).
- Fixed bugs with std::array #7799.
- Fixed compilation with -ftrapv and numeric to numeric conversions #7814.
Locale:
- Security related bug fix, some invalid UTF-8 sequences where accepted as valid #7743
- Invalid Windows codepage names used #7386
- Fixed missing documentation, caused by a error in Doxygen formatting #7734
- Fixed missing std:: in some places #7701
- Spelling, grammar, typos fixes #7368, #7762
Math:
- Fixed issues #7325, #7415, #7416, #7183, #7649, #7694, #4445 and #7492.
- Fixed mistake in calculating pooled standard deviation in two-sample students t example #7402.
- Improve complex acos/asin/atan, see #7290, #7291.
- Improve accuracy in some corner cases of cyl_bessel_j and gamma_p/gamma_q thanks to suggestions from Rocco Romeo.
- Improve accuracy in Bessel J and Y with integer orders thanks to suggestions from Rocco Romeo.
MinMax:
- Fixed a misuse of the comma operator (#7752).
- Updated the docs to fix broken link (#7751).
Move:
- Better header segregation (bug #6524).
- Small documentation fixes
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- Fixed #7830, #7832.
Polygon:
- Fixes:
  - #6366 Bug in boost::polygon::contains for polygon_90 type.
  - #7678 multiple definitions of bool boost::polygon::belongs(...) by multiple #include.
- Internal changes:
  - refactored point/segment/interval data/concept/traits.
  - added unit tests for point and interval data/concept/traits.
  - simplified transform.hpp to operate only in 2D.
  - removed point_3d data/concept/traits.
Random:
- Now compiles with exceptions disabled (#5399).
Range:
- Bug fixes:
  - #5603 the "range/any_range.hpp" header is not self-sufficient
  - #6103 boost::range_detail vs. boost::range::range_detail compiler error
- Documentation fixes:
  - #5160
  - #5314
  - #5440
  - #5775
  - #6212
  - #7585
  - #7843
  - #7916
  - #7926
Ratio:
- Fixes:
  - #7616 br_mul::nan - warning C4293: '<<' : shift count negative or too big, undefined behavior`.
Regex: Fixed Issues: #7744, #7644.
Smart Pointers:
- New Features:
  - Glen Fernandes provided implementations of make_shared and allocate_shared for arrays. They achieve a single allocation for an array that can be initialized with constructor arguments or initializer lists as well as overloads for default initialization and no value initialization. See the 'make_shared and allocate_shared for arrays' page for more information.
  - shared_ptr can now be used to hold a pointer to a dynamically allocated array. This is accomplished by using an array type (T[] or T[N]) as the template parameter.
  - Smart pointers now use explicit operator bool on C++11 compilers. This can break code that passes a smart pointer to a function taking a bool, or that returns a smart pointer from a function with a bool return type. Please use p != 0 or !!p in such cases.
StringAlgo:
- Fixed a bug where it wouldn't find overlapping patterns (#7784).
- Disambiguated some calls to insert (#7346).
Thread:
- Deprecated features:
  - Deprecated features since boost 1.53 will be available only until boost 1.58.
  - C++11 compliance: packaged_task<R> is deprecated, use instead packaged_task<R()>.
  - #7537 deprecate Mutex::scoped_lock and scoped_try_lock and boost::condition
- New Features:
  - #6270 C++11 compliance: Add thread constructor from movable callable and movable arguments
  - #7279 C++11 compliance: Add noexcept in system related functions
  - #7280 C++11 compliance: Add promise::...at_thread_exit functions
  - #7281 C++11 compliance: Add ArgTypes to packaged_task template.
  - #7282 C++11 compliance: Add packaged_task::make_ready_at_thread_exit function
  - #7412 C++11 compliance: Add async from movable callable and movable arguments
  - #7413 C++11 compliance: Add async when the launch policy is deferred.
  - #7414 C++11 compliance: future::get post-condition should be valid()==false.
  - #7422 Provide a condition variable with zero-overhead performance penality.
  - #7444 Async: Add make_future/make_shared_future.
  - #7540 Threads: Add a helper class that join a thread on destruction.
  - #7541 Threads: Add a thread wrapper class that joins on destruction.
  - #7575 C++11 compliance: A future created by async should "join" in the destructor.
  - #7587 Synchro: Add strict_lock and nested_strict_lock.
  - #7588 Synchro: Split the locks.hpp in several files to limit dependencies.
  - #7590 Synchro: Add lockable concept checkers based on Boost.ConceptCheck.
  - #7591 Add lockable traits that can be used with enable_if.
  - #7592 Synchro: Add a null_mutex that is a no-op and that is a model of UpgardeLockable.
  - #7593 Synchro: Add a externally_locked class.
  - #7594 Threads: Allow to disable thread interruptions.
- Fixed Bugs:
  - #7464 BOOST_TEST(n_alive == 1); fails due to race condition in a regression test tool.
  - #7657 Serious performance and memory consumption hit if condition_variable methods condition notify_one or notify_all is used repeatedly.
  - #7665 this_thread::sleep_for no longer uses steady_clock in thread.
  - #7668 thread_group::join_all() should check whether its threads are joinable.
  - #7669 thread_group::join_all() should catch resource_deadlock_would_occur.
  - #7671 Error including boost/thread.hpp header on iOS.
  - #7672 lockable_traits.hpp syntax error: "defined" token misspelled.
  - #7798 boost::future set_wait_callback thread safety issues.
  - #7808 Incorrect description of effects for this_thread::sleep_for and this_thread::sleep_until.
  - #7812 Returns: cv_status::no_timeout if the call is returning because the time period specified by rel_time has elapsed, cv_status::timeout otherwise.
  - #7874 compile warning: thread.hpp:342: warning: type attributes are honored only at type definition.
  - #7875 BOOST_THREAD_THROW_IF_PRECONDITION_NOT_SATISFIED should not be enabled by default.
  - #7882 wrong exception text from condition_variable::wait(unique_lock<mutex>&).
  - #7890 thread::do_try_join_until() is missing a return type.
Unordered:
- Remove support for the old pre-standard variadic pair constructors, and equality implementation. Both have been deprecated since Boost 1.48.
- More internal implementation changes, including a much simpler implementation of erase, and removed more deprecated config macros.
Utility:
- Added string_ref, a non-owning reference to a contiguous sequence of characters.
Variant:
- Added rvalue constructors and rvalue assignment operators (for C++11 compatible compilers only). Library now can be used with move-only types (#7620, #7718).
Wave:
- See the Changelog for details.
xpressive:
- Accomodate recent smart pointer changes (#7809).

Updated Tools

Boost Build System:
- Qt5 toolset
- improved rcc support (#7576)

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.1.2, 4.2.4, 4.4.4, 4.5.3, 4.6.3, 4.7.2
- GCC, C++11 mode: 4.4.4, 4.5.3, 4.6.3, 4.7.2
- Intel: 11.1, 12.1
- LLVM Clang: 2.8
- LLVM Clang, with libc++: 3.2
OS X:
- GCC: 4.4.7
- GCC, C++11 mode: 4.4.4
- Intel: 11.1, 12.0
Windows:
- Visual C++: 9.0, 10.0
FreeBSD:
- GCC: 4.2.1, 32 and 64 bit

Boost's additional test compilers include:

Linux:
- Cray: 4.6.1
- Clang: from subversion
- LLVM Clang, with libc++: 3.2
- GCC: 4.2.4, 4.4.4, 4.5.3, 4.6.3, 4.7.1
- GCC, C++11 mode: 4.4.4, 4.5.3, 4.6.3, 4.7.1, 4.7.2
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.1
- Intel, C++11 mode: 13.0.1
- Visual Age:
OS X:
- Clang: from subversion
- Clang, C++11 mode: from subversion
- Intel: 11.1, 12.0
- GCC: 4.4.7
- GCC, C++11 mode: 4.4.4
Windows:
- Visual C++: 10.0, 11.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
AIX:
- IBM XL C/C++ Enterprise Edition: V12.1.0.1

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.