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| <a name="boost.log.attributes.function"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Class template function</span></h2> |
| <p>boost::log::attributes::function — A class of an attribute that acquires its value from a third-party function object. </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: <<a class="link" href="../../../attributes.html#header.boost.log.attributes.function_hpp" title="Header <boost/log/attributes/function.hpp>">boost/log/attributes/function.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> R<span class="special">></span> |
| <span class="keyword">class</span> <a class="link" href="function.html" title="Class template function">function</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">attribute</span> <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">R</span> <a name="boost.log.attributes.function.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> <span class="comment">// The attribute value type. </span> |
| |
| <span class="comment">// member classes/structs/unions</span> |
| |
| <span class="comment">// Base class for factory implementation.</span> |
| |
| <span class="keyword">class</span> <a class="link" href="function/impl.html" title="Class impl">impl</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">attribute</span><span class="special">::</span><span class="identifier">impl</span> <span class="special">{</span> |
| <span class="special">}</span><span class="special">;</span> |
| |
| <span class="comment">// Factory implementation.</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <span class="keyword">class</span> <a class="link" href="function/impl_template.html" title="Class template impl_template">impl_template</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">function</span><span class="special"><</span> <span class="identifier">R</span> <span class="special">></span><span class="special">::</span><span class="identifier">impl</span> <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="comment">// <a class="link" href="function/impl_template.html#boost.log.attributes.function.impl_templateconstruct-copy-destruct">construct/copy/destruct</a></span> |
| <span class="keyword">explicit</span> <a class="link" href="function/impl_template.html#idp42083728-bb"><span class="identifier">impl_template</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="function/impl_template.html#idp42080832-bb">public member functions</a></span> |
| <span class="keyword">virtual</span> <a class="link" href="../attribute_value.html" title="Class attribute_value">attribute_value</a> <a class="link" href="function/impl_template.html#idp42081392-bb"><span class="identifier">get_value</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="function.html#boost.log.attributes.functionconstruct-copy-destruct">construct/copy/destruct</a></span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="function.html#idp42087296-bb"><span class="identifier">function</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">explicit</span> <a class="link" href="function.html#idp42089824-bb"><span class="identifier">function</span></a><span class="special">(</span><a class="link" href="cast_source.html" title="Class cast_source">cast_source</a> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp107627632"></a><h2>Description</h2> |
| <p>The attribute calls a stored nullary function object to acquire each value. The result type of the function object is the attribute value type.</p> |
| <p>It is not recommended to use this class directly. Use <code class="computeroutput">make_function</code> convenience functions to construct the attribute instead. </p> |
| <div class="refsect2"> |
| <a name="idp107629472"></a><h3> |
| <a name="boost.log.attributes.functionconstruct-copy-destruct"></a><code class="computeroutput">function</code> |
| public |
| construct/copy/destruct</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">explicit</span> <a name="idp42087296-bb"></a><span class="identifier">function</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> fun<span class="special">)</span><span class="special">;</span></pre> |
| <p>Initializing constructor </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp42089824-bb"></a><span class="identifier">function</span><span class="special">(</span><a class="link" href="cast_source.html" title="Class cast_source">cast_source</a> <span class="keyword">const</span> <span class="special">&</span> source<span class="special">)</span><span class="special">;</span></pre> |
| <p>Constructor for casting support </p> |
| </li> |
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| <td align="right"><div class="copyright-footer">Copyright © 2007-2015 Andrey |
| Semashev<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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