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  29 <h2><span class="refentrytitle">Function template operator&lt;&lt;</span></h2>
  30 <p>boost::logic::operator&lt;&lt; &#8212; Writes the indeterminate tribool value to a stream. </p>
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  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <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="../../tribool/reference.html#header.boost.logic.tribool_io_hpp" title="Header &lt;boost/logic/tribool_io.hpp&gt;">boost/logic/tribool_io.hpp</a>&gt;
  34
  35 </span>
  36 <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> Traits<span class="special">&gt;</span>
  37   <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">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
  38   <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">Traits</span> <span class="special">&gt;</span> <span class="special">&amp;</span> out<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span></pre></div>
  39 <div class="refsect1">
  40 <a name="idp369435696"></a><h2>Description</h2>
  41 <p>This routine outputs either the integer value 2 (if <code class="computeroutput">(out.flags() &amp; std::ios_base::boolalpha) == 0</code>) or the name of the indeterminate value. The name of the indeterminate value comes from the <code class="computeroutput"><a class="link" href="indeterminate_name.html" title="Class template indeterminate_name">indeterminate_name</a></code> facet (if it is defined in the output stream's locale), or from the get_default_indeterminate_name function (if it is not defined in the locale or if the C++ standard library implementation does not support locales).</p>
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  50 <td><p><span class="term">Returns:</span></p></td>
  51 <td><p><code class="computeroutput">out</code> </p></td>
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  58 <td align="right"><div class="copyright-footer">Copyright &#169; 2002-2004 Douglas Gregor<p>Use, modification and distribution is subject to the Boost
  59     Software License, Version 1.0. (See accompanying file
  60     <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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