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>
<span class="keyword">struct</span> <a class="link" href="once_block_flag.html" title="Struct once_block_flag">once_block_flag</a> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45736162420992"></a><h2>Description</h2>