1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Class cast_source</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Boost.Log v2"> 8<link rel="up" href="../../../attributes.html#header.boost.log.attributes.attribute_cast_hpp" title="Header <boost/log/attributes/attribute_cast.hpp>"> 9<link rel="prev" href="../swap_idm46079579923840.html" title="Function swap"> 10<link rel="next" href="../attribute_cast.html" title="Function template attribute_cast"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td></tr></table> 14<hr> 15<div class="spirit-nav"> 16<a accesskey="p" href="../swap_idm46079579923840.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../attributes.html#header.boost.log.attributes.attribute_cast_hpp"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../attribute_cast.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 17</div> 18<div class="refentry"> 19<a name="boost.log.attributes.cast_source"></a><div class="titlepage"></div> 20<div class="refnamediv"> 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: <<a class="link" href="../../../attributes.html#header.boost.log.attributes.attribute_cast_hpp" title="Header <boost/log/attributes/attribute_cast.hpp>">boost/log/attributes/attribute_cast.hpp</a>> 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#idm46079579911552-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#idm46079579916080-bb">public member functions</a></span> 34 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">T</span> <span class="special">*</span> <a class="link" href="cast_source.html#idm46079579915520-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="idm44984885954608"></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="idm44984885953936"></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="idm46079579911552-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="idm44984885945472"></a><h3> 51<a name="idm46079579916080-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"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">T</span> <span class="special">*</span> <a name="idm46079579915520-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> 68</div> 69</div> 70</div> 71<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 72<td align="left"></td> 73<td align="right"><div class="copyright-footer">Copyright © 2007-2019 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>). 76 </p> 77</div></td> 78</tr></table> 79<hr> 80<div class="spirit-nav"> 81<a accesskey="p" href="../swap_idm46079579923840.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../attributes.html#header.boost.log.attributes.attribute_cast_hpp"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../attribute_cast.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 82</div> 83</body> 84</html> 85
