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???, 2006 - Version 1.34.0

New Libraries

• Foreach Library: BOOST_FOREACH macro for easily iterating over the elements of a sequence, from Eric Niebler.
• Statechart Library: Arbitrarily complex finite state machines can be implemented in easily readable and maintainable C++ code, from Andreas Huber.
• TR1 Library: An implementation of the C++ Technical Report on Standard Library Extensions, from John Maddock. This library does not itself implement the TR1 components, rather it's a thin wrapper that will include your standard library's TR1 implementation (if it has one), otherwise it will include the Boost Library equivalents, and import them into namespace std::tr1. Highlights include: Reference Wrappers, Smart Pointers, result_of, Function Object Binders, Polymorphic function wrappers, Type Traits, Random Number Generators and Distributions, Tuples, Fixed Size Array, Hash Function Objects, Regular Expressions, and Complex Number Additional Algorithms.
• Typeof Library: Typeof operator emulation, from Arkadiy Vertleyb and Peder Holt.
• Xpressive Library: Regular expressions that can be written as strings or as expression templates, and that can refer to each other and themselves recursively with the power of context-free grammars, from Eric Niebler.

Updated Libraries

• Assign Library:
  • Support for ptr_map<key,T> via the new function ptr_map_insert()
  • Support for initialization of Pointer Containers when the containers hold pointers to an abstract base class.
• Filesystem Library: Major upgrade in preparation for submission to the C++ Standards Committee for TR2. Changes include:
  • Internationalization, provided by class templates basic_path, basic_filesystem_error, basic_directory_iterator, and basic_directory_entry.
  • Simplification of the path interface by eliminating special constructors to identify native formats.
  • Rationalization of predicate function design, including the addition of several new functions.
  • Clearer specification by reference to POSIX, the ISO/IEEE Single Unix Standard, with provisions for Windows and other operating systems.
  • Preservation of existing user code whenever possible.
  • More efficient directory iteration.
  • Addition of a recursive directory iterator.
• Function Library: Boost.Function now implements a small buffer optimization, which can drastically improve the performance when copying or construction Boost.Function objects storing small function objects. For instance, bind(&X:foo, &x, _1, _2) requires no heap allocation when placed into a Boost.Function object.
• Functional/Hash Library
  • Use declarations for standard classes, so that the library doesn't need to include all of their headers
  • Deprecated the <boost/functional/hash/*.hpp> headers.
  • Add support for the BOOST_HASH_NO_EXTENSIONS macro, which disables the extensions to TR1
  • Minor improvements to the hash functions for floating point numbers.
• Graph Library:
  • edmonds_maximum_cardinality_matching, from Aaron Windsor.
  • lengauer_tarjan_dominator_tree, from JongSoo Park.
  • compressed_sparse_row_graph, from Jeremiah Willcock and Douglas Gregor of Indiana University.
  • sorted_erdos_renyi_iterator, from Jeremiah Willcock of Indiana University.
  • biconnected_components now supports a visitor and named parameters, from Janusz Piwowarski.
  • adjacency_matrix now models the Bidirectional Graph concept.
  • dijkstra_shortest_paths now calls vis.initialize_vertex for each vertex during initialization.
  • See the complete revision history for more information.
• MultiArray Library: Boost.MultiArray now by default provides range-checking for operator[]. Range checking can be disabled by defining the macro BOOST_DISABLE_ASSERTS before including multi_array.hpp. A bug in multi_array::resize() related to storage orders was fixed.
• Multi-index Containers Library:
  • New random access indices.
  • Non key-based indices feature new rearrange facilities.
  • This version also includes a number of optimizations and usage improvements. For a complete list of changes, see the library release notes.
• Parameter Library:
  • Every ArgumentPack is now a valid MPL Forward Sequence.
  • Support for unnamed arguments (those whose keyword is deduced from their types) is added.
  • Support for named and unnamed template arguments is added.
  • New overload generation macros solve the forwarding problem directly.
  • See also the Python library changes, below.
• Pointer Container Library:
  • Support for serialization via Boost.Serialization.
  • Exceptions can be disabled by defining the macro BOOST_PTR_CONTAINER_NO_EXCEPTIONS before including any header. This macro is defined by default if BOOST_NO_EXCEPTIONS is defined.
  • Additional std::auto_ptr<T> overloads added s.t. one can also pass std::auto_ptr<T> instead of only T* arguments to member functions.
  • transfer() now has weaker requirements s.t. one can transfer objects from ptr_container<Derived> to ptr_container<Base>,
• Python Library:
  • Boost.Python now automatically appends C++ signatures to docstrings. The new docstring_options.hpp header is available to control the content of docstrings.
  • stl_input_iterator, for turning a Python iterable object into an STL input iterator, from Eric Niebler.
  • Support for void* conversions is added.
  • Integrated support for wrapping C++ functions built with the parameter library; keyword names are automatically known to docsstrings.
• Smart Pointers Library:
  • Allocator support as proposed in N1851 (162 Kb PDF).
  • pointer_cast and pointer_to_other utilities to allow pointer-independent code, from Ion Gaztanaga.
• String Algorithm Library:
  • lexicographical_compare
  • join
  • New comparison predicates is_less, is_not_greater.
  • Negative indexes support (like Perl) in various algorihtms (*_head/tail, *_nth).
• Wave Library:
  • Wave now correctly recognizes pp-number tokens as mandated by the C++ Standard, which are converted to C++ tokens right before they are returned from the library.
  • Several new preprocessing hooks have been added. For a complete description please refer to the related documentation page: The Context Policy.
  • Shared library (dll) support has been added for the generated Wave libraries.
  • The overall error handling has been improved. It is now possible to recover and continue after an error or a warning was issued.
  • Support for optional comment and/or full whitespace preservation in the generated output stream has been added.
  • The Wave library now performs automatic include guard detection to avoid accessing header files more than once, if appropriate.
  • Full interactive mode has been added to the Wave tool. Now the Wave tool can be used just like Python or Perl for instance to interactively try out your BOOST_PP macros. Additionally it is now possible to load and save the current state of an interactive session (macro tables et.al.).
  • The overall performance has been improved by upto 30-40%, depending on the concrete files to process.
  • Support for new pragmas has been added allowing to control certain library features from inside the preprocessed sources (partial output redirection, control of generated whitespace and #line directives).
    
  • This version also includes a number of bug fixes and usage improvements. For a complete list of changes, see the libraries change log.