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28<h2><span class="refentrytitle">Macro BOOST_ONCE_INIT</span></h2>
29<p>BOOST_ONCE_INIT &#8212; The call_once function and
30                <code class="computeroutput">once_flag</code> type (statically initialized to
31                <a href="BOOST_ONCE_INIT.html" title="Macro BOOST_ONCE_INIT">BOOST_ONCE_INIT</a>) can be used to run a
32                routine exactly once. This can be used to initialize data in a
33                <a href="thread.html#thread.glossary.thread-safe">thread-safe</a>
34                manner.</p>
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36<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
37<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis">BOOST_ONCE_INIT</pre></div>
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39<a name="id1739988"></a><h2>Description</h2>The implementation-defined macro
40                <a href="BOOST_ONCE_INIT.html" title="Macro BOOST_ONCE_INIT">BOOST_ONCE_INIT</a> is a constant value used to
41                initialize <code class="computeroutput">once_flag</code> instances to indicate that the
42                logically associated routine has not been run yet. See
43                call_once for more details.</div>
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