doc/html/boost/typeindex/type_index_facade.html


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<div class="refentry">
<a name="boost.typeindex.type_index_facade"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template type_index_facade</span></h2>
<p>boost::typeindex::type_index_facade</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_typeindex_header_reference.html#header.boost.type_index.type_index_facade_hpp" title="Header &lt;boost/type_index/type_index_facade.hpp&gt;">boost/type_index/type_index_facade.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Derived<span class="special">,</span> <span class="keyword">typename</span> TypeInfo<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="type_index_facade.html" title="Class template type_index_facade">type_index_facade</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">TypeInfo</span> <a name="boost.typeindex.type_index_facade.type_info_t"></a><span class="identifier">type_info_t</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4-bb">public member functions</a></span>
  <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4_1-bb"><span class="identifier">name</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4_2-bb"><span class="identifier">pretty_name</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4_3-bb"><span class="identifier">equal</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Derived</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4_4-bb"><span class="identifier">before</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Derived</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_4_5-bb"><span class="identifier">hash_code</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_5-bb">protected member functions</a></span>
  <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_5_1-bb"><span class="identifier">raw_name</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">const</span> <span class="identifier">type_info_t</span> <span class="special">&amp;</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_5_2-bb"><span class="identifier">type_info</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_6-bb">protected static functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">Derived</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_6_1-bb"><span class="identifier">type_id</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">Derived</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_6_2-bb"><span class="identifier">type_id_with_cvr</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">Derived</span> <a class="link" href="type_index_facade.html#id-1_3_42_8_11_1_1_1_6_3-bb"><span class="identifier">type_id_runtime</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.42.8.11.3.4"></a><h2>Description</h2>
<p>This class takes care about the comparison operators, hash functions and ostream operators. Use this class as a public base class for defining new type_info-conforming classes.</p>
<p><span class="bold"><strong>Example:</strong></span> </p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">stl_type_index</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">type_index_facade</span><span class="special">&lt;</span><span class="identifier">stl_type_index</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&gt;</span> 
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
    <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span> <span class="identifier">type_info_t</span><span class="special">;</span>
<span class="keyword">private</span><span class="special">:</span>
    <span class="keyword">const</span> <span class="identifier">type_info_t</span><span class="special">*</span> <span class="identifier">data_</span><span class="special">;</span>

<span class="keyword">public</span><span class="special">:</span>
    <span class="identifier">stl_type_index</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">type_info_t</span><span class="special">&amp;</span> <span class="identifier">data</span><span class="special">)</span> <span class="keyword">noexcept</span>
        <span class="special">:</span> <span class="identifier">data_</span><span class="special">(</span><span class="special">&amp;</span><span class="identifier">data</span><span class="special">)</span>
    <span class="special">{</span><span class="special">}</span>
<span class="comment">// ...</span>
<span class="special">}</span><span class="special">;</span>
</pre>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Take a look at the protected methods. They are <span class="bold"><strong>not</strong></span> <span class="bold"><strong>defined</strong></span> in <a class="link" href="type_index_facade.html" title="Class template type_index_facade">type_index_facade</a>. Protected member functions raw_name() <span class="bold"><strong>must</strong></span> be defined in Derived class. All the other methods are mandatory. </p></td></tr>
</table></div>
<p>
</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p>'Making a custom type_index' section for more information about creating your own type_index using <a class="link" href="type_index_facade.html" title="Class template type_index_facade">type_index_facade</a>. </p>
<p>
</p>
<div class="refsect2">
<a name="id-1.3.42.8.11.3.4.5"></a><h3>Template Parameters</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> Derived</pre>
<p>Class derived from <code class="computeroutput"><a class="link" href="type_index_facade.html" title="Class template type_index_facade">type_index_facade</a></code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> TypeInfo</pre>
<p>Class that will be used as a base type_info class. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.42.8.11.3.4.6"></a><h3>
<a name="id-1_3_42_8_11_1_1_1_4-bb"></a><code class="computeroutput">type_index_facade</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> <a name="id-1_3_42_8_11_1_1_1_4_1-bb"></a><span class="identifier">name</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Name of a type. By default returns Derived::raw_name(). </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a name="id-1_3_42_8_11_1_1_1_4_2-bb"></a><span class="identifier">pretty_name</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides may throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Human readable type name. By default returns Derived::name(). </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_42_8_11_1_1_1_4_3-bb"></a><span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Derived</span> <span class="special">&amp;</span> rhs<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>True if two types are equal. By default compares types by raw_name(). </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_42_8_11_1_1_1_4_4-bb"></a><span class="identifier">before</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Derived</span> <span class="special">&amp;</span> rhs<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>True if rhs is greater than this. By default compares types by raw_name(). </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="id-1_3_42_8_11_1_1_1_4_5-bb"></a><span class="identifier">hash_code</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Derived class header <span class="bold"><strong>must</strong></span> include &lt;boost/container_hash/hash.hpp&gt;, <span class="bold"><strong>unless</strong></span> this function is redefined in Derived class to not use boost::hash_range(). </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Hash code of a type. By default hashes types by raw_name(). </p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.42.8.11.3.4.7"></a><h3>
<a name="id-1_3_42_8_11_1_1_1_5-bb"></a><code class="computeroutput">type_index_facade</code> protected member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> <a name="id-1_3_42_8_11_1_1_1_5_1-bb"></a><span class="identifier">raw_name</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>must</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Pointer to unredable/raw type name. </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">type_info_t</span> <span class="special">&amp;</span> <a name="id-1_3_42_8_11_1_1_1_5_2-bb"></a><span class="identifier">type_info</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Const reference to underlying low level type_info_t. </p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.42.8.11.3.4.8"></a><h3>
<a name="id-1_3_42_8_11_1_1_1_6-bb"></a><code class="computeroutput">type_index_facade</code> protected static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">Derived</span> <a name="id-1_3_42_8_11_1_1_1_6_1-bb"></a><span class="identifier">type_id</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id() will call this method, if Derived has same type as boost::typeindex::type_index.</p>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined and made public in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. Overrides <span class="bold"><strong>must</strong></span> remove const, volatile &amp;&amp; and &amp; modifiers from T. 

</p>
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<td><p><span class="term">Template Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
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<td><p><span class="term"><code class="computeroutput">T</code></span></p></td>
<td><p>Type for which type_index must be created. </p></td>
</tr></tbody>
</table></div></td>
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<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>type_index for type T. </p></td>
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<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">Derived</span> <a name="id-1_3_42_8_11_1_1_1_6_2-bb"></a><span class="identifier">type_id_with_cvr</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id_with_cvr() will call this method, if Derived has same type as boost::typeindex::type_index.</p>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined and made public in Derived class. Overrides <span class="bold"><strong>must</strong></span> not throw. Overrides <span class="bold"><strong>must</strong></span> <span class="bold"><strong>not</strong></span> remove const, volatile &amp;&amp; and &amp; modifiers from T. 

</p>
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<td><p><span class="term">Template Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
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<td><p><span class="term"><code class="computeroutput">T</code></span></p></td>
<td><p>Type for which type_index must be created. </p></td>
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</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>type_index for type T. </p></td>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> 
  <span class="keyword">static</span> <span class="identifier">Derived</span> <a name="id-1_3_42_8_11_1_1_1_6_3-bb"></a><span class="identifier">type_id_runtime</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span> variable<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id_runtime(const T&amp;) will call this method, if Derived has same type as boost::typeindex::type_index.</p>
<p><span class="bold"><strong>Override:</strong></span> This function <span class="bold"><strong>may</strong></span> be redefined and made public in Derived class. 

</p>
<div class="variablelist"><table border="0" class="variablelist compact">
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<col align="left" valign="top">
<col>
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<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
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</colgroup>
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<td><p><span class="term"><code class="computeroutput">variable</code></span></p></td>
<td><p>Variable which runtime type will be stored in type_index. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>type_index with runtime type of variable. </p></td>
</tr>
</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2012-2016 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>)
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