1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Struct impl</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="../attribute.html#idm44984886202736" title="Description"> 9<link rel="prev" href="../attribute.html" title="Class attribute"> 10<link rel="next" href="../swap_idm46079579923840.html" title="Function swap"> 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="../attribute.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../attribute.html#idm44984886202736"><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="../swap_idm46079579923840.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 17</div> 18<div class="refentry"> 19<a name="boost.log.attribute.impl"></a><div class="titlepage"></div> 20<div class="refnamediv"> 21<h2><span class="refentrytitle">Struct impl</span></h2> 22<p>boost::log::attribute::impl — A base class for an attribute value factory. </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_hpp" title="Header <boost/log/attributes/attribute.hpp>">boost/log/attributes/attribute.hpp</a>> 26 27</span> 28 29<span class="comment">// A base class for an attribute value factory.</span> 30 31<span class="keyword">struct</span> <a class="link" href="impl.html" title="Struct impl">impl</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive_ref_counter</span><span class="special"><</span> <span class="identifier">impl</span> <span class="special">></span> <span class="special">{</span> 32 <span class="comment">// <a class="link" href="impl.html#boost.log.attribute.implconstruct-copy-destruct">construct/copy/destruct</a></span> 33 <a class="link" href="impl.html#idm46079581163280-bb"><span class="special">~</span><span class="identifier">impl</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 34 35 <span class="comment">// <a class="link" href="impl.html#idm46079581167376-bb">public member functions</a></span> 36 <span class="keyword">virtual</span> <a class="link" href="../attribute_value.html" title="Class attribute_value">attribute_value</a> <a class="link" href="impl.html#idm46079581166816-bb"><span class="identifier">get_value</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 37 38 <span class="comment">// <a class="link" href="impl.html#idm46079581162704-bb">public static functions</a></span> 39 <span class="keyword">static</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="impl.html#idm46079581162144-bb"><span class="keyword">operator</span> <span class="keyword">new</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span><span class="special">;</span> 40 <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="impl.html#idm46079581160336-bb"><span class="keyword">operator</span> <span class="keyword">delete</span></a><span class="special">(</span><span class="keyword">void</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 41<span class="special">}</span><span class="special">;</span></pre></div> 42<div class="refsect1"> 43<a name="idm44984886050000"></a><h2>Description</h2> 44<p>All attributes must derive their implementation from this class. </p> 45<div class="refsect2"> 46<a name="idm44984886049248"></a><h3> 47<a name="boost.log.attribute.implconstruct-copy-destruct"></a><code class="computeroutput">impl</code> 48 public 49 construct/copy/destruct</h3> 50<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 51<pre class="literallayout"><a name="idm46079581163280-bb"></a><span class="special">~</span><span class="identifier">impl</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Virtual destructor. </li></ol></div> 52</div> 53<div class="refsect2"> 54<a name="idm44984886042752"></a><h3> 55<a name="idm46079581167376-bb"></a><code class="computeroutput">impl</code> public member functions</h3> 56<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 57<pre class="literallayout"><span class="keyword">virtual</span> <a class="link" href="../attribute_value.html" title="Class attribute_value">attribute_value</a> <a name="idm46079581166816-bb"></a><span class="identifier">get_value</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span></pre> 58<p> 59</p> 60<div class="variablelist"><table border="0" class="variablelist compact"> 61<colgroup> 62<col align="left" valign="top"> 63<col> 64</colgroup> 65<tbody><tr> 66<td><p><span class="term">Returns:</span></p></td> 67<td><p>The actual attribute value. It shall not return empty values (exceptions shall be used to indicate errors). </p></td> 68</tr></tbody> 69</table></div> 70</li></ol></div> 71</div> 72<div class="refsect2"> 73<a name="idm44984886032192"></a><h3> 74<a name="idm46079581162704-bb"></a><code class="computeroutput">impl</code> public static functions</h3> 75<div class="orderedlist"><ol class="orderedlist" type="1"> 76<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <span class="special">*</span> <a name="idm46079581162144-bb"></a><span class="keyword">operator</span> <span class="keyword">new</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">)</span><span class="special">;</span></pre></li> 77<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <a name="idm46079581160336-bb"></a><span class="keyword">operator</span> <span class="keyword">delete</span><span class="special">(</span><span class="keyword">void</span> <span class="special">*</span> p<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li> 78</ol></div> 79</div> 80</div> 81</div> 82<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 83<td align="left"></td> 84<td align="right"><div class="copyright-footer">Copyright © 2007-2019 Andrey Semashev<p> 85 Distributed under the Boost Software License, Version 1.0. (See accompanying 86 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>). 87 </p> 88</div></td> 89</tr></table> 90<hr> 91<div class="spirit-nav"> 92<a accesskey="p" href="../attribute.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../attribute.html#idm44984886202736"><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="../swap_idm46079579923840.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 93</div> 94</body> 95</html> 96
