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            <h1><img id="boost-logo" src="more/boost-dark-trans.png" alt=
            "Boost C++ Libraries" width="237" height="55" name=
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            <p id="heading-quote"><span class="quote">&ldquo;...one of the
            most highly regarded and expertly designed C++ library projects
            in the world.&rdquo;</span> <span class="attribution">&mdash;
            <a href="http://www.gotw.ca/">Herb Sutter</a> and <a href=
            "http://en.wikipedia.org/wiki/Andrei_Alexandrescu">Andrei
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                <div class="section" id="intro">
                  <h1>Welcome to Boost.org!</h1>

                  <div class="section-body">
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                      <div class="section-body-1">
                        <p>Boost provides free peer-reviewed portable C++
                        source libraries.</p>

                        <p>We emphasize libraries that work well with the C++
                        Standard Library. Boost libraries are intended to be
                        widely useful, and usable across a broad spectrum of
                        applications. The <a href=
                        "more/license_info.html">Boost license</a> encourages
                        both commercial and non-commercial use.</p>

                        <p>We aim to establish "existing practice" and
                        provide reference implementations so that Boost
                        libraries are suitable for eventual standardization.
                        Ten Boost libraries are already included in the
                        <a href="http://www.open-std.org/jtc1/sc22/wg21">C++
                        Standards Committee's</a> Library Technical Report (
                        <a href=
                        "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1745.pdf">
                        TR1</a>) as a step toward becoming part of a future
                        C++ Standard. More Boost libraries are proposed for
                        the upcoming <a href=
                        "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1810.html">
                        TR2</a>.</p>

                        <p class="note"><span class="note-label">Getting
                        started:</span> <span class="note-body">Boost works
                        on almost any modern operating system, including UNIX
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                        Boost packages. Boost may also already be available
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                        <p class="note"><span class=
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                        "note-body">The <a href=
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                        page</a> has introductory material to help those
                        educating their organization about Boost.</span></p>
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                        <p>Although Boost was begun by members of the C++
                        Standards Committee Library Working Group,
                        participation has expanded to include thousands of
                        programmers from the C++ community at large.</p>

                        <p>If you are interested in participating in Boost,
                        please join our main <a href=
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                <div class="section" id="news">
                  <h2>Latest News</h2>

                  <div class="section-body">
                    <div class="section-body-0">
                      <div class="section-body-1">
                        <h3>June ???, 2007 - Version 1.34.1</h3>

                        <h4>Updated Libraries</h4>

                        <ul>
                          <li>
                            <span class="library"><a href=
                            "doc/html/hash.html">Functional/Hash
                            Library</a></span>
                            <ul>
                              <li>Avoid an incorrect (but normally useful)
                              warning about 64-bit incompatibility
                              in Visual C++.</li>
                            </ul>
                          </li>
                          <li>
                            <span class="library"><a href=
                            "libs/python/index.html">Python
                            Library</a>:</span>

                            <ul>
                              <li>Add missing <code>eval</code> function.</li>
                              <li>Update "Embedding" chapter in the
                                  <a href="libs/python/doc/tutorial/index.html">
                                    tutorial.</a>
                              </li>
                            </ul>
                          </li>
                          <li><span class="library"><a href=
                          "doc/html/xpressive.html">Xpressive
                          Library</a>:</span>
                            <ul>
                              <li>Fix for bug <a href=
                              "http://svn.boost.org/trac/boost/ticket/1035">
                              #1035</a>: <code>regex_error</code> exception
                              when quantifying some non-capturing groups.
                              </li>
                              <li>Fix for bug <a href=
                              "http://svn.boost.org/trac/boost/ticket/1026">
                              #1026</a>: <code>regex_token_iterator</code>
                              crashes.
                              </li>
                              <li>Fix compilation problem on GCC 4.2.
                              </li>
                            </ul>
                          </li>
                        </ul>

                        <h3>May 12, 2007 - Version 1.34.0</h3>

                        <h4>New Libraries</h4>

                        <ul>
                          <li><span class="library"><a href=
                          "doc/html/foreach.html">Foreach Library</a>:</span>
                          <tt>BOOST_FOREACH</tt> macro for easily iterating
                          over the elements of a sequence, from Eric
                          Niebler.</li>

                          <li><span class="library"><a href=
                          "libs/statechart/doc/index.html">Statechart 
                          Library</a>:</span> Arbitrarily complex finite state
                          machines can be implemented in easily readable and
                          maintainable C++ code, from Andreas Huber.</li>

                          <li><span class="library"><a href=
                          "libs/tr1/index.html">TR1 Library</a>:</span> 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 <code>std::tr1</code>. 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.</li>

                          <li><span class="library"><a href=
                          "doc/html/typeof.html">Typeof 
                          Library</a>:</span> Typeof operator emulation, 
                          from Arkadiy Vertleyb and Peder Holt.</li>

                          <li><span class="library"><a href=
                          "doc/html/xpressive.html">Xpressive
                          Library</a>:</span> 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.</li>
                        </ul>

                        <h4>Updated Libraries</h4>

                        <ul>

                          <li>
                            <span class="library"><a href=
                            "libs/assign/index.html">Assign
                            Library</a>:</span>

                            <ul>
                              <li>Support for
                              <code>ptr_map&lt;key,T&gt;</code> via the new
                              function <code>ptr_map_insert()</code></li>

                              <li>Support for initialization of <a href=
                              "libs/ptr_container/index.html">Pointer
                              Containers</a> when the containers hold
                              pointers to an abstract base class.</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "doc/html/date_time.html">Date_time library</a>:</span>
                            <ul>
                              <li>Support for new US/Canada timezone rules and
                                  other bug fixes.  See 
                                  <a href="doc/hmtl/date_time/details.html#changes">Change History</a>
                                  for details.
                              </li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "libs/filesystem/doc/index.htm">Filesystem
                            Library</a>:</span> Major upgrade in preparation
                            for submission to the C++ Standards Committee for
                            TR2. Changes include:

                            <ul>
                              <li><a href=
                              "libs/filesystem/doc/i18n.html#Internationalization">
                              Internationalization</a>, provided by class
                              templates <i>basic_path</i>,
                              <i>basic_filesystem_error</i>,
                              <i>basic_directory_iterator</i>, and
                              <i>basic_directory_entry</i>.</li>

                              <li><a href=
                              "libs/filesystem/doc/i18n.html#Simplification">Simplification</a>
                              of the path interface by eliminating special
                              constructors to identify native formats.</li>

                              <li><a href=
                              "libs/filesystem/doc/i18n.html#Rationalization">
                              Rationalization</a> of predicate function
                              design, including the addition of several new
                              functions.</li>

                              <li>Clearer specification by reference to
                              <a href=
                              "libs/filesystem/doc/design.htm#POSIX-01">POSIX</a>,
                              the ISO/IEEE Single Unix Standard, with
                              provisions for Windows and other operating
                              systems.</li>

                              <li><a href=
                              "libs/filesystem/doc/i18n.html#Preservation">Preservation</a>
                              of existing user code whenever possible.</li>

                              <li><a href=
                              "libs/filesystem/doc/i18n.html#More_efficient">More
                              efficient</a> directory iteration.</li>

                              <li>Addition of a <a href=
                              "libs/filesystem/doc/tr2_proposal.html#Class-template-basic_recursive_directory_iterator">
                              recursive directory iterator</a>.</li>
                            </ul>
                          </li>

                          <li><span class="library"><a href=
                          "libs/function/index.html">Function
                          Library</a>:</span> Boost.Function now implements a
                          small buffer optimization, which can drastically
                          improve the performance when copying or
                          constructing Boost.Function objects storing small
                          function objects. For instance,
                          <code>bind(&amp;X:foo, &amp;x, _1, _2)</code>
                          requires no heap allocation when placed into a
                          Boost.Function object.</li>

                          <li>
                            <span class="library"><a href=
                            "libs/functional/hash/index.html">Functional/Hash
                            Library</a></span>

                            <ul>
                              <li>Use declarations for standard classes, so
                              that the library doesn't need to include all of
                              their headers</li>

                              <li>Deprecated the
                              <tt>&lt;boost/functional/hash/*.hpp&gt;</tt>
                              headers.</li>

                              <li>Add support for the
                              <tt>BOOST_HASH_NO_EXTENSIONS</tt> macro, which
                              disables the extensions to TR1</li>

                              <li>Minor improvements to the hash functions
                              for floating point numbers.</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "libs/graph/doc/index.html">Graph
                            Library</a>:</span>

                            <ul>
                              <li><a href=
                              "libs/graph/doc/maximum_matching.html"><tt>edmonds_maximum_cardinality_matching</tt></a>,
                              from Aaron Windsor.</li>

                              <li><a href=
                              "libs/graph/doc/lengauer_tarjan_dominator.htm">
                              <tt>lengauer_tarjan_dominator_tree</tt></a>,
                              from JongSoo Park.</li>

                              <li><a href=
                              "libs/graph/doc/compressed_sparse_row.html"><tt>
                              compressed_sparse_row_graph</tt></a>, from
                              Jeremiah Willcock and Douglas Gregor of Indiana
                              University.</li>

                              <li><a href=
                              "libs/graph/doc/sorted_erdos_renyi_gen.html"><tt>sorted_erdos_renyi_iterator</tt></a>,
                              from Jeremiah Willcock of Indiana
                              University.</li>

                              <li><a href=
                              "libs/graph/doc/biconnected_components.html"><tt>
                              biconnected_components</tt></a> now supports a
                              visitor and named parameters, from Janusz
                              Piwowarski.</li>

                              <li><a href=
                              "libs/graph/doc/adjacency_matrix.html"><tt>adjacency_matrix</tt></a>
                              now models the <a href=
                              "libs/graph/doc/BidirectionalGraph.html">Bidirectional
                              Graph</a> concept.</li>

                              <li><a href=
                              "libs/graph/doc/dijkstra_shortest_paths.html"><tt>
                              dijkstra_shortest_paths</tt></a> now calls
                              <tt>vis.initialize_vertex</tt> for each vertex
                              during initialization.</li>

			      <li><a
			      href="libs/graph/doc/bellman_ford_shortest.html"><tt>bellman_ford_shortest_paths</tt></a>:
			      fixed a bug where certain negative
			      cycles were not correctly detected.</li>

			      <li><b>Note:</b> the name of the
			      compiled library for the <a
			      href="libs/graph/doc/read_graphviz.html">GraphViz
			      reader</a> has changed to
			      <code>boost_graph</code> (from
			      <code>bgl-viz</code>) to match Boost
			      conventions.</li>

                              <li>See the <a href=
                              "libs/graph/doc/history.html#1.34.1">complete
                              revision history</a> for more information.</li>
                            </ul>
                          </li>

                          <li><span class="library"><a href=
                          "libs/multi_array/index.html">MultiArray
                          Library</a>:</span> Boost.MultiArray now by default
                          provides range-checking for
                          <code>operator[]</code>. Range checking can be
                          disabled by defining the macro
                          <code>BOOST_DISABLE_ASSERTS</code> before including
                          <tt>multi_array.hpp</tt>. A bug in
                          <code>multi_array::resize()</code> related
                          to storage orders was fixed.</li>

                          <li>
                            <span class="library"><a href=
                            "libs/multi_index/doc/index.html">Multi-index
                            Containers Library</a>:</span>

                            <ul>
                              <li>New <a href=
                              "libs/multi_index/doc/tutorial/indices.html#rnd_indices">
                              random access indices</a>.</li>

                              <li>Non key-based indices feature new <a href=
                              "libs/multi_index/doc/tutorial/indices.html#rearrange">
                              rearrange facilities</a>.</li>

                              <li>This version also includes a number of
                              optimizations and usage improvements. For a
                              complete list of changes, see the library
                              <a href=
                              "libs/multi_index/doc/release_notes.html#boost_1_34">
                              release notes</a>.</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "libs/optional/index.html">Optional Library</a>:</span>
                            
                            <ul>
                            <li><code>boost::none_t and boost::none</code> now added to Optional's documentation</li>
                            <li>Relational operators now directly support arguments of type <code>'T'</code> and <code>'none_t'</code></li>
                            <li>operator->() now also works with reference types.</li>
                            <li>Helper functions <code>make_optional(val), make_optional(cond,val) and
                            get_optional_value_or(opt,alternative_value)</code> added.</li>
                            <li>Constructor taking a boolean condition (as well as a value) added.</li>
                            <li>Member function <code>get_value_or(alternative_value)</code> added.</li>
                            <li>Incompatbility bug with mpl::apply&lt;&gt; fixed.</li>
                            <li>Converting assignment bug with uninitialized lvalues fixed.</li>
                            </ul>
                          </li>
                          
                          <li>
                            <span class="library"><a href=
                            "libs/parameter/index.html">Parameter
                            Library</a>:</span>

                            <ul>
                              <li>Every ArgumentPack is now a valid <a href=
                              "libs/mpl/doc/refmanual/forward-sequence.html">MPL
                              Forward Sequence.</a></li>

                              <li>Support for unnamed arguments (those whose
                              keyword is deduced from their types) is
                              added.</li>

                              <li>Support for named and unnamed template
                              arguments is added.</li>

                              <li>New overload generation macros solve the
                              <a href=
                              "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm">
                              forwarding problem</a> directly.</li>

                              <li>See also the Python library changes,
                              below.</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "libs/ptr_container/index.html">Pointer Container
                            Library</a>:</span>

                            <ul>
                              <li>Support for serialization via <a href=
                              "libs/serialization/index.html">Boost.Serialization.</a></li>

                              <li>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.</li>

                              <li>Additional
                              <code>std::auto_ptr&lt;T&gt;</code> overloads
                              added s.t. one can also pass
                              <code>std::auto_ptr&lt;T&gt;</code> instead of
                              only <code>T*</code> arguments to member
                              functions.</li>

                              <li><code>transfer()</code> now has weaker
                              requirements s.t. one can transfer objects from
                              <code>ptr_container&lt;Derived&gt;</code> to
                              <code>ptr_container&lt;Base&gt;</code>,</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href=
                            "libs/python/index.html">Python
                            Library</a>:</span>

                            <ul>
                              <li>Boost.Python now automatically appends C++
                              signatures to docstrings. The new <a href=
                              "libs/python/doc/v2/docstring_options.html"><code>
                              docstring_options.hpp</code></a> header is
                              available to control the content of
                              docstrings.</li>

                              <li><a href=
                              "libs/python/doc/v2/stl_iterator.html#stl_input_iterator-spec">
                              <code>stl_input_iterator</code></a>, for
                              turning a Python iterable object into an STL
                              input iterator, from Eric Niebler.</li>

                              <li>Support for <code>void*</code> conversions
                              is added.</li>

                              <li>Integrated support for wrapping C++
                              functions built with the parameter library;
                              keyword names are automatically known to
                              docsstrings.</li>

                              <li>Enhancements to the API for better embedding support
                              (<code>boost::python::import()</code>,
                              <code>boost::python::exec()</code>,
                              and <code>boost::python::exec_file()</code>).</li>
                              
                            </ul>
                          </li>

                      <li><span class="library"><a href=
                      "doc/html/signals.html">Signals Library</a>:</span>
                      More improvements to signal invocation performance from
                      Robert Zeh.</li>

                          <li>
                            <span class="library"><a href=
                            "libs/smart_ptr/smart_ptr.htm">Smart
                            Pointers Library</a>:</span>

                            <ul>
                              <li><a href=
                              "libs/smart_ptr/shared_ptr.htm#allocator_constructor">
                              Allocator support</a> as proposed in <a href=
                              "http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1851.pdf">
                              N1851</a> (162 Kb PDF).</li>

                              <li><a href=
                              "libs/smart_ptr/pointer_cast.html">
                              <code>pointer_cast</code></a> and <a href=
                              "libs/smart_ptr/pointer_to_other.html">
                              <code>pointer_to_other</code></a> utilities to
                              allow pointer-independent code, from Ion
                              Gaztanaga.</li>
                            </ul>
                          </li>

                          <li>
                            <span class="library"><a href="libs/algorithm/string/index.html">
                            String Algorithm Library</a>:</span>

                            <ul>
                                <li><code>lexicographical_compare</code></li>
                                <li><code>join</code></li>
                                <li>
                                    New comparison predicates <code>is_less</code>, <code>is_not_greater</code>.
                                </li>
                                <li>
                                    Negative indexes support (like Perl) in various algorihtms
                                    (<code>*_head/tail</code>, <code>*_nth</code>).
                                </li>                                        
                            </ul>
                          </li>  
                          <li>
                            <span class="library"><a href=
                            "libs/wave/index.html">Wave
                            Library</a>:</span>

                            <ul>
                              <li>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.</li>

                              <li>Several new preprocessing hooks have been
                              added. For a complete description please refer
                              to the related documentation page: <a href=
                              "libs/wave/doc/class_reference_ctxpolicy.html">The
                              Context Policy</a>.</li>

                              <li>Shared library (dll) support has been added
                              for the generated Wave libraries.</li>

                              <li>The overall error handling has been
                              improved. It is now possible to recover and
                              continue after an error or a warning was
                              issued.</li>

                              <li>Support for optional comment and/or full
                              whitespace preservation in the generated output
                              stream has been added.</li>

                              <li>The Wave library now performs automatic 
                              include guard detection to avoid accessing header 
                              files more than once, if appropriate. </li>
                              
                              <li>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.).</li>

                              <li>The overall performance has been improved by upto 
                              40-60%, depending on the concrete files to process. </li>

                              <li>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).</li>

                              <li>Optional support for #pragma message &quot;...&quot; 
                               has been added. </li>
                               
                              <li>This version also includes a number of bug
                              fixes and usage improvements. For a complete
                              list of changes, see the libraries <a href=
                              "libs/wave/ChangeLog">change log</a>.</li>
                            </ul>
                          </li>
                        </ul>

                        <h4>Supported Compilers</h4>

                        <p>Boost is tested on a wide range of compilers and
                        platforms. Since Boost libraries rely on modern C++
                        features not available in all compilers, not all
                        Boost libraries will work with every compiler. The
                        following compilers and platforms have been
                        extensively tested with Boost, although many other
                        compilers and platforms will work as well. For more
                        information, see the <a href=
                        "http://www.boost.org/regression/release/user/">regression
                        test results</a>.</p>

                        <ul>
                          <li><a href="http://developer.apple.com/">Apple
                          GCC</a> 4.0.1 on Mac OS X.</li>

                          <li><a href=
                          "http://www.borland.com/us/products/cbuilder/">Borland
                          C++</a> 5.8.2 on Windows.</li>

                          <li><a href="http://gcc.gnu.org/">GNU C++</a>
                            <ul>
                              <li>
                                3.2.x., 3.3.x, 3.4.x, 4.0.x, 4.1.x on Linux
                              </li>
                              <li>
                                4.1.x on Solaris
                              </li>
                              <li>
                                3.4.x on Windows
                              </li>
                            </ul>
                          </li>

                          <li><a href="http://h30097.www3.hp.com/cplus/">HP
                          C++ for Tru64 UNIX 7.1</a>.</li>

                          <li><a href="http://www.hp.com/go/c++">HP
                          aC++ A.06.14</a>.</li>

                          <li><a href=
                          "http://www.intel.com/cd/software/products/asmo-na/eng/compilers/index.htm">
                          Intel C++</a> 9.1 on Windows, 9.0 on Linux.</li>

                          <li><a href="http://www.metrowerks.com/">Metrowerks
                          CodeWarrior</a> 9.4 on Windows.</li>

                          <li><a href=
                          "http://msdn.microsoft.com/visualc/">Microsoft
                          Visual C++</a> 6.0 (sp5, with and without STLport),
                          7.0, 7.1, 8.0. Note: Boost does not support the
                          non-standard "Safe" C++ Library shipping with
                          Visual C++ 8.0, which may result in many spurious
                          warnings from Boost headers and other
                          standards-conforming C++ code. To suppress these
                          warnings, define the macro
                          <code>_SCL_SECURE_NO_DEPRECATE</code>.</li>

                          <li><a href="http://developers.sun.com/sunstudio/compilers_index.html">
                          Sun Studio 11</a>
                          on Solaris.</li>
                          
                        </ul>

                        <h4>Acknowledgements</h4>

                        <p><a href="people/thomas_witt.html">Thomas Witt</a>
                        managed this release.</p>
                        
                        <p>A great number of people contributed their time
                        and expertise to make this release possible. Special
                        thanks go to Vladimir Prus for making Boost.Build version 2
                        a reality, David Abrahams for authoring a new Getting
                        Started guide, Rene Rivera for general build and installation support
                        and Greg D. for answering countless questions.</p>
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