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   4 <title>Class cast_source</title>
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  19 <a name="boost.log.attributes.cast_source"></a><div class="titlepage"></div>
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  21 <h2><span class="refentrytitle">Class cast_source</span></h2>
  22 <p>boost::log::attributes::cast_source</p>
  23 </div>
  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <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="../../../attributes.html#header.boost.log.attributes.attribute_cast_hpp" title="Header &lt;boost/log/attributes/attribute_cast.hpp&gt;">boost/log/attributes/attribute_cast.hpp</a>&gt;
  26
  27 </span>
  28 <span class="keyword">class</span> <a class="link" href="cast_source.html" title="Class cast_source">cast_source</a> <span class="special">{</span>
  29 <span class="keyword">public</span><span class="special">:</span>
  30   <span class="comment">// <a class="link" href="cast_source.html#boost.log.attributes.cast_sourceconstruct-copy-destruct">construct/copy/destruct</a></span>
  31   <span class="keyword">explicit</span> <a class="link" href="cast_source.html#idp61484064-bb"><span class="identifier">cast_source</span></a><span class="special">(</span><a class="link" href="../attribute/impl.html" title="Struct impl">attribute::impl</a> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  32
  33   <span class="comment">// <a class="link" href="cast_source.html#idp61479696-bb">public member functions</a></span>
  34   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">T</span> <span class="special">*</span> <a class="link" href="cast_source.html#idp61480256-bb"><span class="identifier">as</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  35 <span class="special">}</span><span class="special">;</span></pre></div>
  36 <div class="refsect1">
  37 <a name="idp103953248"></a><h2>Description</h2>
  38 <p>The class holds a reference to the attribute factory implementation being casted </p>
  39 <div class="refsect2">
  40 <a name="idp103954016"></a><h3>
  41 <a name="boost.log.attributes.cast_sourceconstruct-copy-destruct"></a><code class="computeroutput">cast_source</code>
  42         public
  43        construct/copy/destruct</h3>
  44 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  45 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp61484064-bb"></a><span class="identifier">cast_source</span><span class="special">(</span><a class="link" href="../attribute/impl.html" title="Struct impl">attribute::impl</a> <span class="special">*</span> p<span class="special">)</span><span class="special">;</span></pre>
  46 <p>Initializing constructor. Creates a source that refers to the specified factory implementation. </p>
  47 </li></ol></div>
  48 </div>
  49 <div class="refsect2">
  50 <a name="idp103962544"></a><h3>
  51 <a name="idp61479696-bb"></a><code class="computeroutput">cast_source</code> public member functions</h3>
  52 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  53 <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="identifier">T</span> <span class="special">*</span> <a name="idp61480256-bb"></a><span class="identifier">as</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  54 <p>The function attempts to cast the aggregated pointer to the implementation to the specified type.</p>
  55 <p>
  56 </p>
  57 <div class="variablelist"><table border="0" class="variablelist compact">
  58 <colgroup>
  59 <col align="left" valign="top">
  60 <col>
  61 </colgroup>
  62 <tbody><tr>
  63 <td><p><span class="term">Returns:</span></p></td>
  64 <td><p>The converted pointer or <code class="computeroutput">NULL</code>, if the conversion fails. </p></td>
  65 </tr></tbody>
  66 </table></div>
  67 </li></ol></div>
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  73 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
  74         Distributed under the Boost Software License, Version 1.0. (See accompanying
  75         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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