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  21 <h2><span class="refentrytitle">Function template operator&lt;&lt;</span></h2>
  22 <p>boost::log::operator&lt;&lt; &#8212; Stream output operator. </p>
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  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <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.value_ref_hpp" title="Header &lt;boost/log/utility/value_ref.hpp&gt;">boost/log/utility/value_ref.hpp</a>&gt;
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  28 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> TraitsT<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span>
  29   <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
  30   <span class="keyword">operator</span><span class="special">&lt;&lt;</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span> strm<span class="special">,</span>
  31              <a class="link" href="value_ref.html" title="Class template value_ref">value_ref</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> val<span class="special">)</span><span class="special">;</span></pre></div>
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