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| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="boost_typeindex.getting_started"></a><a class="link" href="getting_started.html" title="Getting started">Getting started</a> |
| </h2></div></div></div> |
| <div class="toc"><dl class="toc"> |
| <dt><span class="section"><a href="getting_started.html#boost_typeindex.getting_started.how_to_use">How to use</a></span></dt> |
| <dt><span class="section"><a href="getting_started.html#boost_typeindex.getting_started.example_with_boost_any">Example |
| with Boost.Any</a></span></dt> |
| <dt><span class="section"><a href="getting_started.html#boost_typeindex.getting_started.example_with_boost_variant">Example |
| with Boost.Variant</a></span></dt> |
| </dl></div> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_info.html" title="Type definition type_info">boost::typeindex::type_info</a></code> |
| is a drop-in replacement for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span></code> |
| and <code class="computeroutput"><a class="link" href="../boost/typeindex/type_index.html" title="Type definition type_index">boost::typeindex::type_index</a></code> |
| is a drop-in replacement for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span></code>. |
| Unlike Standard Library versions those classes can work without RTTI. |
| </p> |
| <p> |
| <code class="computeroutput"><span class="identifier">type_index</span></code> provides the full |
| set of comparison operators, hashing functions and ostream operators, so it |
| can be used with any container class. |
| </p> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_typeindex.getting_started.how_to_use"></a><a class="link" href="getting_started.html#boost_typeindex.getting_started.how_to_use" title="How to use">How to use</a> |
| </h3></div></div></div> |
| <p> |
| To start using Boost.TypeIndex: |
| </p> |
| <div class="informaltable"> |
| <a name="boost_typeindex.getting_started.how_to_use.porting"></a><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Replace this: |
| </p> |
| </th> |
| <th> |
| <p> |
| With the following: |
| </p> |
| </th> |
| <th> |
| <p> |
| More Info |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">typeinfo</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">typeindex</span><span class="special">></span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_index</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost_typeindex_header_reference.html#header.boost.type_index_hpp" title="Header <boost/type_index.hpp>">more... </a></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_index</span> |
| </pre> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_index.html" title="Type definition type_index">more... </a></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span> |
| <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">).</span><span class="identifier">name</span><span class="special">()</span> <span class="comment">// not human readable</span> |
| <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">variable</span><span class="special">)</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id</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">typeindex</span><span class="special">::</span><span class="identifier">type_id</span><span class="special"><</span><span class="identifier">T</span><span class="special">>().</span><span class="identifier">pretty_name</span><span class="special">()</span> <span class="comment">// human readable</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id_runtime</span><span class="special">(</span><span class="identifier">variable</span><span class="special">)</span> |
| </pre> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_id.html" title="Function template type_id">more... </a></code> |
| </p> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_index.html" title="Type definition type_index">more... </a></code> |
| </p> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_id_runtime.html" title="Function template type_id_runtime">more... |
| </a></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// attempt to save const, volatile, reference</span> |
| <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">please_save_modifiers</span><span class="special"><</span><span class="identifier">T</span><span class="special">>)</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// cvr = const, volatile, reference</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id_with_cvr</span><span class="special"><</span><span class="identifier">T</span><span class="special">>()</span> |
| </pre> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_id_with_cvr.html" title="Function template type_id_with_cvr">more... |
| </a></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// when reference to `std::type_info` is required</span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="identifier">v1</span> <span class="special">=</span> <span class="keyword">typeid</span><span class="special">(</span><span class="keyword">int</span><span class="special">);</span> |
| |
| <span class="comment">// other cases</span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">*</span> <span class="identifier">v2</span> <span class="special">=</span> <span class="special">&</span><span class="keyword">typeid</span><span class="special">(</span><span class="keyword">int</span><span class="special">);</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="identifier">v1</span> |
| <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id</span><span class="special"><</span><span class="keyword">int</span><span class="special">>().</span><span class="identifier">type_info</span><span class="special">();</span> |
| |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_index</span> <span class="identifier">v2</span> |
| <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id</span><span class="special"><</span><span class="keyword">int</span><span class="special">>();</span> |
| </pre> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_index.html" title="Type definition type_index">more... </a></code> |
| </p> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/typeindex/type_id.html" title="Function template type_id">more... </a></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| If you are using <code class="computeroutput"><a class="link" href="../boost/typeindex/type_id_runtime.html" title="Function template type_id_runtime">type_id_runtime()</a></code> |
| methods and RTTI is disabled, make sure that classes that are passed to |
| <code class="computeroutput"><span class="identifier">type_id_runtime</span><span class="special">()</span></code> |
| are marked with <code class="computeroutput"><a class="link" href="../BOOST_TYPE_INDEX_REGISTER_CLASS.html" title="Macro BOOST_TYPE_INDEX_REGISTER_CLASS">BOOST_TYPE_INDEX_REGISTER_CLASS</a></code> |
| macro. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_typeindex.getting_started.example_with_boost_any"></a><a class="link" href="getting_started.html#boost_typeindex.getting_started.example_with_boost_any" title="Example with Boost.Any">Example |
| with Boost.Any</a> |
| </h3></div></div></div> |
| <p> |
| Here is how TypeIndex could be used in <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">any</span><span class="special">.</span><span class="identifier">hpp</span></code>: |
| </p> |
| <div class="informaltable"> |
| <a name="boost_typeindex.getting_started.example_with_boost_any.any"></a><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Before |
| </p> |
| </th> |
| <th> |
| <p> |
| With TypeIndex |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">typeinfo</span><span class="special">></span></pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_index</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></pre> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span> <span class="special">&</span> <span class="identifier">type</span><span class="special">()</span> <span class="keyword">const</span> <span class="identifier">BOOST_NOEXCEPT</span> |
| <span class="special">{</span> |
| <span class="comment">// requires RTTI</span> |
| <span class="keyword">return</span> <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">ValueType</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_info</span> <span class="special">&</span> <span class="identifier">type</span><span class="special">()</span> <span class="keyword">const</span> <span class="identifier">BOOST_NOEXCEPT</span> |
| <span class="special">{</span> |
| <span class="comment">// now works even with RTTI disabled</span> |
| <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id</span><span class="special"><</span><span class="identifier">ValueType</span><span class="special">>().</span><span class="identifier">type_info</span><span class="special">();</span> |
| <span class="special">}</span> |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_typeindex.getting_started.example_with_boost_variant"></a><a class="link" href="getting_started.html#boost_typeindex.getting_started.example_with_boost_variant" title="Example with Boost.Variant">Example |
| with Boost.Variant</a> |
| </h3></div></div></div> |
| <p> |
| Here is how TypeIndex could be used in <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">variant</span><span class="special">/</span><span class="identifier">variant</span><span class="special">.</span><span class="identifier">hpp</span></code>: |
| </p> |
| <div class="informaltable"> |
| <a name="boost_typeindex.getting_started.example_with_boost_variant.variant"></a><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Before |
| </p> |
| </th> |
| <th> |
| <p> |
| With TypeIndex |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#if</span> <span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_TYPEID</span><span class="special">)</span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">typeinfo</span><span class="special">></span> <span class="comment">// for typeid, std::type_info</span> |
| <span class="preprocessor">#endif</span> <span class="comment">// BOOST_NO_TYPEID</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_index</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#if</span> <span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_TYPEID</span><span class="special">)</span> |
| |
| <span class="keyword">class</span> <span class="identifier">reflect</span> |
| <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">static_visitor</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&></span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> <span class="comment">// visitor interfaces</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&)</span> <span class="keyword">const</span> <span class="identifier">BOOST_NOEXCEPT</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">T</span><span class="special">);</span> |
| <span class="special">}</span> |
| |
| <span class="special">};</span> |
| |
| <span class="preprocessor">#endif</span> <span class="comment">// BOOST_NO_TYPEID</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">class</span> <span class="identifier">reflect</span> |
| <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">static_visitor</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&></span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> <span class="comment">// visitor interfaces</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&)</span> <span class="keyword">const</span> <span class="identifier">BOOST_NOEXCEPT</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_id</span><span class="special"><</span><span class="identifier">T</span><span class="special">>().</span><span class="identifier">type_info</span><span class="special">();</span> |
| <span class="special">}</span> |
| |
| <span class="special">};</span> |
| </pre> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#if</span> <span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_TYPEID</span><span class="special">)</span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="identifier">type</span><span class="special">()</span> <span class="keyword">const</span> |
| <span class="special">{</span> |
| <span class="identifier">detail</span><span class="special">::</span><span class="identifier">variant</span><span class="special">::</span><span class="identifier">reflect</span> <span class="identifier">visitor</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">this</span><span class="special">-></span><span class="identifier">apply_visitor</span><span class="special">(</span><span class="identifier">visitor</span><span class="special">);</span> |
| <span class="special">}</span> |
| <span class="preprocessor">#endif</span> |
| </pre> |
| </td> |
| <td> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <span class="identifier">type</span><span class="special">()</span> <span class="keyword">const</span> |
| <span class="special">{</span> |
| <span class="identifier">detail</span><span class="special">::</span><span class="identifier">variant</span><span class="special">::</span><span class="identifier">reflect</span> <span class="identifier">visitor</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">this</span><span class="special">-></span><span class="identifier">apply_visitor</span><span class="special">(</span><span class="identifier">visitor</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| </td> |
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| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2012-2014 Antony Polukhin<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
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