New Libraries

• Chrono: Useful time utilities, from Vicente J. Botet Escribá.
• Geometry: Geometry Library, from Barend Gehrels, Bruno Lalande and Mateusz Loskot.
• Phoenix: Define small unnamed function objects at the actual call site, and more, from Joel de Guzman, Dan Marsden and Thomas Heller.
• Ratio: Compile time rational arithmetic, from Vicente J. Botet Escribá.

Updated Libraries

• Accumulators:

  • New statistical accumulators: sum_kahan, sum_of_weights_kahan, sum_of_variates_kahan.
• Asio:

  • Many new features and improvements:

    • Signal handling.
    • A debugging aid for asynchronous programs.
    • Timeouts on socket iostreams.
    • Composed connect operations.
    • Rewritten SSL implementation.
    • C++0x move support.
    • Compatibility with POSIX fork().
    • ... and much more. See the Revision History in the Boost.Asio documentation for more details.
  • Tickets addressed: #2879, #3238, #3297, #3307, #3702, #3741, #3900, #3905, #3939, #3958, #4162, #4971, #5124, #5128, #5418, #5453.
• Config:

  • Fixed bug #1988
• DateTime:

  • Fixed bugs #4920, #3651, #4845, #4475, #4952, #5345, #5250, #4798, #4754, #4411, #5126, #4780, #2475, #1674.
• Dynamic Bitset:

  • Fixed bug #5439
• Foreach:

  • Use rvalue refs on supporting compilers for const rvalue detection.
• Function:

  • Bug fixes: #3410, #3618, #3912, #4073, #4325, #4717, #4765.
• Function Types:

  • Bug fixes: #1653, #3162.
• Graph:

  • Bug fixes.
  • Remove deprecated function kolmogorov_max_flow, use boykov_kolmogorov_max_flow instead.
  • Removed <boost/graph/detail/is_same.hpp> header since its functionality is in Boost.Type_Traits.
• Iostreams:

  • Support filesystem v3 paths (#4485).
  • Fix a memory leak in chain (#4922).
• Iterator:

  • Add function_input_iterator (#2893).
  • Bug fixes: #1427, #1517, #3434.
• Lexical cast:

  • Better performance and less memory usage for many combinations of Source and Target types (#5564, #5417, #4397, #5350, #5576).
  • Documentation updated (#5576, #5494).
• Logic:

  • Bug fixes: #3093, #3600.
• Math:

  • Added changesign function to sign.hpp to facilitate addition of nonfinite facets.
  • Addition of nonfinite facets from Johan Rade, with tests, examples of use for C99 format infinity and NaN, and documentation.
  • Added tests and documentation of changesign from Johan Rade.
• Meta State Machine:

  • Added a stop() method in the back-end.
  • Added partial support for Boost.Phoenix functors in eUML.
  • Added the possibility to choose when state switching occurs.
  • Bugfixes:

    • #5117, #5253, #5533, #5573.
    • gcc warnings about unused variables.
    • better implementation of favor_compile_time back-end policy.
    • bug with eUML and state construction.
    • incorrect eUML event and state macros.
    • incorrect event type passed to a direct entry state's on_entry action.
    • more examples.
• MultiIndex:

  • Fixed an ADL problem in composite_key_compare related with Boost.Ref.
  • Maintenance fixes.
• Proto:

  • Pre-preprocessed for better compile times.
  • Default preprocessor limits raised:

    • Max expression arity (BOOST_PROTO_MAX_ARITY) bumped from 5 to 10.
    • Max function call arity (BOOST_PROTO_MAX_FUNCTION_CALL_ARITY) bumped from 5 to 10.
    • Max logical operator arity (BOOST_PROTO_MAX_LOGICAL_ARITY) bumped from 8 to 10.
  • Better integration of proto::basic_expr to avoid accidental needless instantiations of proto::expr.
• Random:

  • Synchronized with the new standard.

    • Many new distributions added: chi_squared_distribution, negative_binomial_distribution, fisher_f_distribution, student_t_distribution, weibull_distribution, extreme_value_distribution, discrete_distribution, piecewise_constant_distribution, piecewise_liear_distribution
    • Renamed uniform_int and uniform_real to uniform_int_distribution and uniform_real_distribution.
    • Added members to all distributions: param_type, param, stream operators, comparison operators, min and max.
    • Allow distributions to be used directly with generators without use of variate_generator.
    • Changed the meaning of the parameters of geometric_distribution and lognormal_distribution.
    • Added a second parameter to gamma_distribution.
    • Added seed_seq and added the corresponding constructors and seed overloads the generators.
    • Added generate_canonical.
    • Renamed the engine tempates. e.g. mersenne_twister becomes mersenne_twister_engine.
    • New engine adapter independent_bits_engine.
    • Added new predefined engine typedefs: mt19937_64, ranlux[24|48][_base], knuth_b.
    • Updated seeding algorithms.
    • Added discard
    • Use unsigned types instead of signed types in all the predefined engines.
  • Bug fixes:

    • linear_congruential_engine could assert because the modular arithmetic was not implemented in all cases. shuffle_output, now called shuffle_order_engine, could cause integer overflow. These cases were not triggered by any predefined engines.
    • uniform_small_int now actually behaves as documented.
  • New efficient algorithms for binomial_distribution and poisson_distribution.
  • Moved all features into namespace boost::random
  • Backwards compatibility issues:

    • The seeding algorithms have changed. This was unavoidable for compatibility with the standard. Not to mention that some of the existing algorithms were weird and inconsistent.

      • Seeding with an integer: The behaviour should be unchanged for most generators except lagged_fibonacci and subtract_with_carry (and thus ranlux).
      • Seeding a generator with another generator: This has been enabled by making all all generators models of SeedSeq. Therefore, if you seed a Boost.Random generator with a non Boost.Random generator, your code will no longer compile. The algorithm has changed, so code using this seeding method will yield different values.
      • Seeding a generator from a pair of iterators: This implicitly assumed that the elements were 32-bit integers in some places, but not everywhere. I've added this requirement everywhere and updated the algorithms accordingly. The behaviour of generators with a value_type no more than 32 bits should be unchanged.
    • Renaming:

      • Whenever a class was renamed, there is a wrapper with the old name. There are also using declarations in namespace boost for everything that was moved.
      • The names of a few accessors in the distributions changed. Both the old and the new names are allowed.
    • geometric_distribution and lognormal_distribution: The behaviour is different at runtime. boost::geometric_distribution and boost::lognormal_distribution provide the old behaviour, boost::random::geometric_distribution and boost::random::lognormal_distribution provide the new behaviour.
    • Streaming: gamma_distribution has a new parameter, thus text saved with the old version will not readable by the new version.
    • variate_generator is now a simple pass through wrapper. Code that assumes that it will adjust the generator's result type to match the distribution will no longer work. This is not an issue with any of the distributions provided by Boost.Random.
    • Return types: The result_types of some generators have changed slightly. Some signed types have changed to unsigned to match the standard.
    • has_fixed_range: This is now always false, as it doesn't appear to be very useful and is excessively cumbersome. Anything that was accessing const_min and const_max without first checking has_fixed_range was incorrect to begin with.
• Range:

  • Fixed the end position irange when step size is greater than 1 (#5544).
• Spirit:

  • Spirit V2.5, see the 'What's New' section for details.
• Tokenizer:

  • Fixed bug #4649.
• Utility:

  • Bug fixes: #4432.
• Uuid:

  • Fixed tickets: (#5570, #4601, #4991, #5145, #5235).
• Wave:

  • Wave V2.3.0, see the Changelog for details.

Build System

• The official name of Boost.Build executable was changed to b2. The bootstrap scripts create a copy with the old name bjam to prevent third-party build scripts from failing.

Updated Tools

• BoostBook:

  • Handle doxygen tags: \see, tparam, ref (for classes only).
  • Support note for classes as well as functions.
• Quickbook:

  • Generate consistent ids for headings.
  • Improved unicode support for windows.
  • Warn about windows paths, as they aren't portable.
  • Reverse deprecation of [br].
  • Support date ranges and comma seperated clauses in copyright attributes.
  • Improved delimeter checking for simple markup (e.g. *bold*).
  • Pass-thru comments in code snippets.
  • __FILENAME__ macro now generates relative paths.
  • Allow quickbook escapes inside comments in syntax highlighted code.

Compilers Tested

Boost's primary test compilers are:

• Linux:

  • LLVM Clang 2.8
  • GCC: 3.4.6, 4.2.4, 4.3.4, 4.3.5, 4.4.1, 4.4.3, 4.4.5, 4.5.1, 4.5.2, 4.6.0, 4.6.1
  • GCC, C++0x mode: 4.3.4, 4.4.3, 4.5.2
  • Intel 12.0
• OS X:

  • Apple Clang 2.1
  • Intel 11.1
  • GCC: 4.2.1, 4.4.4
  • GCC, C++0x mode: 4.4.4
• Windows:

  • Visual C++ 7.1, 9.0, 10.0
  • GCC, mingw: 4.4.0
• FreeBSD:

  • GCC 4.2.1, 64 bit
• QNX:

  • QCC

Boost's additional test compilers include:

• Linux:

  • Clang from subversion, with GNU libstdc++.
  • LLVM Clang 2.8
  • GCC: 3.4.6, 4.2.4, 4.3.4, 4.3.5, 4.4.3, 4.4.5, 4.5.1, 4.5.2, 4.6.0, 4.6.1
  • GCC, C++0x mode: 4.3.4, 4.4.3, 4.5.2
  • pgCC: 11.2
  • Intel: 10.1, 11.0, 11.1, 12.0
  • PathScale: 3.2
• OS X:

  • Clang from subversion, with GNU libstdc++.
  • Intel 11.1
  • GCC: 4.4.4
  • GCC, C++0x mode: 4.4.4
• Windows:

  • Visual C++ 7.1, 9.0, 10.0
  • Visual C++ with STLport: 9.0
  • Visual C++, Windows Mobile 5, with STLport: 9.0
  • GCC, mingw: 4.5.2
  • GCC, C++0x mode, mingw: 4.5.2
• AIX:

  • IBM XL C/C++ Enterprise Edition, V11.1.0.0

Acknowledgements

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