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  28 <h2><span class="refentrytitle">Function template convert</span></h2>
  29 <p>boost::convert &#8212; Boost.Convert deployment interface with the default converter. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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="../boost_convert_c___reference.html#header.boost.convert_hpp" title="Header &lt;boost/convert.hpp&gt;">boost/convert.hpp</a>&gt;
  33
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  35 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> TypeOut<span class="special">,</span> <span class="keyword">typename</span> TypeIn<span class="special">&gt;</span>
  36   <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special">&lt;</span> <span class="identifier">TypeOut</span> <span class="special">&gt;</span> <span class="identifier">convert</span><span class="special">(</span><span class="identifier">TypeIn</span> <span class="keyword">const</span> <span class="special">&amp;</span> value_in<span class="special">)</span><span class="special">;</span></pre></div>
  37 <div class="refsect1">
  38 <a name="idm45356087248128"></a><h2>Description</h2>
  39 <p>For example, </p>
  40 <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cnv</span><span class="special">::</span><span class="identifier">by_default</span> <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cnv</span><span class="special">::</span><span class="identifier">cstream</span> <span class="special">{</span><span class="special">}</span><span class="special">;</span>
  41
  42 <span class="comment">// boost::cnv::cstream (through boost::cnv::by_default) is deployed</span>
  43 <span class="comment">// as the default converter when no converter is provided explicitly.</span>
  44 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span>    <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">convert</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span><span class="special">(</span><span class="string">"12"</span><span class="special">)</span><span class="special">;</span>
  45 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">s</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">convert</span><span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span><span class="special">(</span><span class="number">123</span><span class="special">.</span><span class="number">456</span><span class="special">)</span><span class="special">;</span>
  46 </pre>
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