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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="core.typeinfo"></a><a class="link" href="typeinfo.html" title="typeinfo">typeinfo</a>
</h2></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="typeinfo.html#core.typeinfo.header_boost_core_typeinfo_hpp">Header
<boost/core/typeinfo.hpp></a></span></dt></dl></div>
<div class="simplesect">
<div class="titlepage"><div><div><h3 class="title">
<a name="idp87685152"></a>Authors</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
Peter Dimov
</li></ul></div>
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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="core.typeinfo.header_boost_core_typeinfo_hpp"></a><a class="link" href="typeinfo.html#core.typeinfo.header_boost_core_typeinfo_hpp" title="Header <boost/core/typeinfo.hpp>">Header
<boost/core/typeinfo.hpp></a>
</h3></div></div></div>
<p>
The header <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">typeinfo</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
defines a class <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">typeinfo</span></code>, which is an alias for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span></code>
when RTTI is enabled, and is a reasonable substitute when RTTI is not supported.
</p>
<p>
The macro <code class="computeroutput"><span class="identifier">BOOST_CORE_TYPEID</span></code>,
when applied to a type <code class="computeroutput"><span class="identifier">T</span></code>,
is the equivalent of <code class="computeroutput"><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code>
and produces a reference to a const <code class="computeroutput"><span class="identifier">typeinfo</span></code>
object.
</p>
<p>
The function <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">demangled_name</span></code> takes a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">typeinfo</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">ti</span></code> and either returns <code class="computeroutput"><span class="identifier">ti</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span></code>,
when that string doesn't need to be demangled, or <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">demangle</span><span class="special">(</span><span class="identifier">ti</span><span class="special">.</span><span class="identifier">name</span><span class="special">())</span></code>,
when it does. The return type of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">demangled_name</span></code>
is <code class="computeroutput"><span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span></code> in the first case and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>
in the second.
</p>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.typeinfo.header_boost_core_typeinfo_hpp.synopsis"></a><a class="link" href="typeinfo.html#core.typeinfo.header_boost_core_typeinfo_hpp.synopsis" title="Synopsis">Synopsis</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
<span class="special">{</span>
<span class="keyword">namespace</span> <span class="identifier">core</span>
<span class="special">{</span>
<span class="keyword">class</span> <span class="identifier">typeinfo</span><span class="special">;</span>
<span class="comment">/* char const* or std::string */</span> <span class="identifier">demangled_name</span><span class="special">(</span> <span class="identifier">typeinfo</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">ti</span> <span class="special">);</span>
<span class="special">}</span>
<span class="special">}</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_CORE_TYPEID</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span> <span class="comment">/*unspecified*/</span>
</pre>
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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.typeinfo.header_boost_core_typeinfo_hpp.example"></a><a class="link" href="typeinfo.html#core.typeinfo.header_boost_core_typeinfo_hpp.example" title="Example">Example</a>
</h4></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">typeinfo</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T2</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">X</span>
<span class="special">{</span>
<span class="special">};</span>
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">X</span><span class="special"><</span><span class="keyword">void</span> <span class="keyword">const</span><span class="special">*,</span> <span class="keyword">void</span><span class="special">(*)(</span><span class="keyword">float</span><span class="special">)></span> <span class="identifier">T</span><span class="special">;</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">typeinfo</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">ti</span> <span class="special">=</span> <span class="identifier">BOOST_CORE_TYPEID</span><span class="special">(</span><span class="identifier">T</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">demangled_name</span><span class="special">(</span> <span class="identifier">ti</span> <span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2014 Peter Dimov<br>Copyright © 2014 Glen Fernandes<br>Copyright © 2014 Andrey Semashev<p>
Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost
Software License, Version 1.0</a>.
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