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| <h2><span class="refentrytitle">Function template if_</span></h2> |
| <p>boost::log::expressions::if_</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: <<a class="link" href="../../../expressions.html#header.boost.log.expressions.formatters.if_hpp" title="Header <boost/log/expressions/formatters/if.hpp>">boost/log/expressions/formatters/if.hpp</a>> |
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| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CondT<span class="special">></span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="identifier">if_</span><span class="special">(</span><span class="identifier">CondT</span> <span class="keyword">const</span> <span class="special">&</span> cond<span class="special">)</span><span class="special">;</span></pre></div> |
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| <a name="idp113474816"></a><h2>Description</h2> |
| <p>The function returns a conditional formatter generator object. The generator provides <code class="computeroutput">operator[]</code> that can be used to construct the actual formatter. The formatter must participate in a streaming expression.</p> |
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| <td><p><span class="term">Parameters:</span></p></td> |
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| <td><p><span class="term"><code class="computeroutput">cond</code></span></p></td> |
| <td><p>A filter expression that will be used as the condition </p></td> |
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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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