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<title>Chapter 1. Boost.TypeIndex 2.1</title>
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="http://www.boost.org/doc/libs/1_53_0/boost.png"></td>
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<td align="center"><a href="http://www.boost.org/doc/libs/1_53_0/index.html">Home</a></td>
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<div class="chapter">
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<div class="titlepage"><div>
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<div><h2 class="title">
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<a name="boost_typeindex"></a>Chapter 1. Boost.TypeIndex 2.1</h2></div>
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<div><p class="copyright">Copyright © 2012, 2013 Antony Polukhin</p></div>
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<div><div class="legalnotice">
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<a name="boost_typeindex.legal"></a><p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="toc">
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<p><b>Table of Contents</b></p>
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<dl>
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<dt><span class="section"><a href="index.html#boost_typeindex.motivation">Motivation</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/getting_started.html">Getting started</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/examples.html">Examples</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="boost_typeindex/examples.html#boost_typeindex.examples.getting_human_readable_and_mangl">Getting
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human readable and mangled type names</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/examples.html#boost_typeindex.examples.storing_information_about_a_type">Storing
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information about a type in container </a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/examples.html#boost_typeindex.examples.getting_through_the_inheritance_">Getting
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through the inheritance to receive a real type name </a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/examples.html#boost_typeindex.examples.exact_type_match_storing_type_wi">Exact
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type match: storing type with const, volatile and reference </a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html">Boost.TypeIndex Header Reference</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html#header.boost.type_index_hpp">Header <boost/type_index.hpp></a></span></dt>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html#header.boost.type_index.type_index_hpp">Header <boost/type_index/type_index.hpp></a></span></dt>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html#header.boost.type_index.template_index_hpp">Header <boost/type_index/template_index.hpp></a></span></dt>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html#header.boost.type_index.template_info_hpp">Header <boost/type_index/template_info.hpp></a></span></dt>
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<dt><span class="section"><a href="boost_typeindex_header_reference.html#header.boost.type_index.type_info_hpp">Header <boost/type_index/type_info.hpp></a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="boost_typeindex/space_and_performance.html">Space and Performance</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/code_bloat.html">Code bloat</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/compiler_support.html">Compiler support</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/mixing_sources_with_rtti_on_and_.html">Mixing
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sources with RTTI on and RTTI off</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/acknowledgements.html">Acknowledgements</a></span></dt>
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</dl>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_typeindex.motivation"></a><a class="link" href="index.html#boost_typeindex.motivation" title="Motivation">Motivation</a>
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</h2></div></div></div>
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<p>
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Sometimes getting and storing information about a type at runtime is required.
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For such cases a construction like <code class="computeroutput"><span class="special">&</span><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code> or C++11 class <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code>
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is usually used. And that is the point, where problems start:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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<code class="computeroutput"><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code> and
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<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code> require Run Time Type Info
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(RTTI)
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</li>
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<li class="listitem">
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some implementations of <code class="computeroutput"><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code>
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strip const, volatile and references from type, while others don't
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</li>
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<li class="listitem">
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some compilers have bugs and do not correctly compare <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span></code>
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objects across shared libraries
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</li>
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<li class="listitem">
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only a few implementations of Standard Library currently provide <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code>
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</li>
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<li class="listitem">
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no easy way to store type info without stripping const, volatile and references
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</li>
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<li class="listitem">
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no nice and portable way to get human readable type names
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</li>
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</ul></div>
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<p>
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Boost.TypeIndex library was designed to work around all those issues.
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</p>
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<div class="note"><table border="0" summary="Note">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="http://www.boost.org/doc/libs/1_53_0/doc/src/images/note.png"></td>
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<th align="left">Note</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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<code class="computeroutput"><span class="identifier">T</span></code> means type here. Think
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of it as of <code class="computeroutput"><span class="identifier">T</span></code> in <code class="computeroutput"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span></code>
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</p></td></tr>
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</table></div>
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<div class="warning"><table border="0" summary="Warning">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="http://www.boost.org/doc/libs/1_53_0/doc/src/images/warning.png"></td>
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<th align="left">Warning</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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During the Boost review was decided, that it is better to use interface close
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to v1.0 of this library. Version 3.0 will attempt to fix all the issues found
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during the review.
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</p></td></tr>
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</table></div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: January 11, 2014 at 14:36:03 GMT</small></p></td>
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