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<h2><span class="refentrytitle">Function template begins_with</span></h2>
<p>boost::log::expressions::begins_with</p>
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<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="../../../expressions.html#header.boost.log.expressions.predicates.begins_with_hpp" title="Header &lt;boost/log/expressions/predicates/begins_with.hpp&gt;">boost/log/expressions/predicates/begins_with.hpp</a>&gt;

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<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span> 
         <span class="keyword">typename</span> SubstringT<span class="special">&gt;</span> 
  <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="identifier">begins_with</span><span class="special">(</span><a class="link" href="attribute_keyword.html" title="Struct template attribute_keyword">attribute_keyword</a><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> 
                          <span class="identifier">SubstringT</span> <span class="keyword">const</span> <span class="special">&amp;</span> substring<span class="special">)</span><span class="special">;</span></pre></div>
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<a name="idp88863136"></a><h2>Description</h2>
<p>The function generates a terminal node in a template expression. The node will check if the attribute value, which is assumed to be a string, begins with the specified substring. </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 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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