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<title>Macro BOOST_LOG_ONCE_BLOCK</title>
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<h2><span class="refentrytitle">Macro BOOST_LOG_ONCE_BLOCK</span></h2>
<p>BOOST_LOG_ONCE_BLOCK</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="utilities.html#header.boost.log.utility.once_block_hpp" title="Header &lt;boost/log/utility/once_block.hpp&gt;">boost/log/utility/once_block.hpp</a>&gt;

</span>BOOST_LOG_ONCE_BLOCK()</pre></div>
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<a name="idm45554723734560"></a><h2>Description</h2>
<p>Begins a code block to be executed only once, with protection against thread concurrency. </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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