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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 1.0</h2></div>
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<div><p class="copyright">Copyright © 2012 Antony Polukhin</p></div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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<dt><span class="section"><a href="boost_typeindex/reference.html">Reference</a></span></dt>
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<dt><span class="section"><a href="boost_typeindex/performance.html">Performance</a></span></dt>
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</dl>
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<div class="section boost_typeindex_motivation">
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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 at runtime information about template type is
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required. For such cases usually used 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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And that is the point, where problems strat: * <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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and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code> require Run Time Type Info (RTTI)
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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> strips
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const, volatile and references from type * some compilers have bugs and do
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not correctly compare <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span></code> across shared libraries * some
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implementations of <code class="computeroutput"><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code> do not
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strip const, volatile and references * only a few STLs have <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code>
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implementation * no easy way to store type info without stripping const, volatile
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and references * no nice and portable way to get human readable type name
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</p>
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<p>
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Boost.TypeIndex was designed to work around those issues.
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</p>
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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: June 03, 2012 at 09:04:50 GMT</small></p></td>
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