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| <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> |
| </div> |
| <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> |
| </div> |
| <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> |
| </div> |
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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>. |
| </p> |
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