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</div>
<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">&lt;</span><span class="identifier">typeinfo</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">typeindex</span><span class="special">&gt;</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">&lt;</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">&gt;</span>
</pre>
              </td>
<td>
                <p>
                  <code class="computeroutput"><a class="link" href="../boost_typeindex_header_reference.html#header.boost.type_index_hpp" title="Header &lt;boost/type_index.hpp&gt;">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">&lt;</span><span class="identifier">T</span><span class="special">&gt;()</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">&lt;</span><span class="identifier">T</span><span class="special">&gt;().</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">&lt;</span><span class="identifier">T</span><span class="special">&gt;)</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">&lt;</span><span class="identifier">T</span><span class="special">&gt;()</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">&amp;</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">&amp;</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">&amp;</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">&lt;</span><span class="keyword">int</span><span class="special">&gt;().</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">&lt;</span><span class="keyword">int</span><span class="special">&gt;();</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">&lt;</span><span class="identifier">typeinfo</span><span class="special">&gt;</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">&lt;</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">&gt;</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">&amp;</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">&amp;</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">&lt;</span><span class="identifier">ValueType</span><span class="special">&gt;().</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">&lt;</span><span class="identifier">typeinfo</span><span class="special">&gt;</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">&lt;</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">&gt;</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">&lt;</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&amp;&gt;</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">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
    <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;)</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">&lt;</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">&amp;&gt;</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">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</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">&amp;</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;)</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">&lt;</span><span class="identifier">T</span><span class="special">&gt;().</span><span class="identifier">type_info</span><span class="special">();</span>
    <span class="special">}</span>

<span class="special">};</span>
</pre>
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<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">&amp;</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">-&gt;</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>
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<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">&amp;</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">-&gt;</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>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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