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  49 <a name="header.boost.convert_hpp"></a>Header &lt;<a href="../../../../boost/convert.hpp" target="_top">boost/convert.hpp</a>&gt;</h3></div></div></div>
  50 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  51   <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/throw_on_failure.html" title="Global throw_on_failure">throw_on_failure</a><span class="special">;</span>
  52   <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">,</span> <span class="keyword">typename</span> Converter<span class="special">&gt;</span>
  53     <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> <a class="link" href="boost/convert_idm45211508362272.html" title="Function template convert"><span class="identifier">convert</span></a><span class="special">(</span><span class="identifier">TypeIn</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  54   <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>
  55     <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> <a class="link" href="boost/convert_idm45211508355024.html" title="Function template convert"><span class="identifier">convert</span></a><span class="special">(</span><span class="identifier">TypeIn</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  56
  57   <span class="comment">// Boost.Convert non-optional deployment interface. </span>
  58   <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">,</span> <span class="keyword">typename</span> Converter<span class="special">&gt;</span>
  59     <span class="identifier">TypeOut</span> <a name="boost.convert_idm45211496504640"></a><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="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span> converter<span class="special">,</span>
  60                     <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span>
  61   <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">,</span> <span class="keyword">typename</span> Converter<span class="special">,</span>
  62            <span class="keyword">typename</span> Fallback<span class="special">&gt;</span>
  63     <span class="identifier">enable_if</span><span class="special">&lt;</span> <span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">Fallback</span><span class="special">,</span> <span class="identifier">TypeOut</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">TypeOut</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  64     <a name="boost.convert_idm45211496499600"></a><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="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span> converter<span class="special">,</span>
  65             <span class="identifier">Fallback</span> <span class="keyword">const</span> <span class="special">&amp;</span> fallback<span class="special">)</span><span class="special">;</span>
  66   <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">,</span> <span class="keyword">typename</span> Converter<span class="special">,</span>
  67            <span class="keyword">typename</span> Fallback<span class="special">&gt;</span>
  68     <span class="identifier">enable_if</span><span class="special">&lt;</span> <span class="identifier">cnv</span><span class="special">::</span><span class="identifier">is_fun</span><span class="special">&lt;</span> <span class="identifier">Fallback</span><span class="special">,</span> <span class="identifier">TypeOut</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">TypeOut</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  69     <a name="boost.convert_idm45211496494112"></a><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="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span> converter<span class="special">,</span>
  70             <span class="identifier">Fallback</span> fallback<span class="special">)</span><span class="special">;</span>
  71   <span class="keyword">namespace</span> <span class="identifier">cnv</span> <span class="special">{</span>
  72     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Converter<span class="special">,</span> <span class="keyword">typename</span> TypeOut<span class="special">,</span> <span class="keyword">typename</span> TypeIn<span class="special">&gt;</span>
  73       <span class="keyword">struct</span> <a class="link" href="boost/cnv/reference.html" title="Struct template reference">reference</a><span class="special">;</span>
  74
  75     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Converter<span class="special">,</span> <span class="keyword">typename</span> TypeOut<span class="special">&gt;</span>
  76       <span class="keyword">struct</span> <a class="link" href="boost/cnv/referenc_idm45211508382320.html" title="Struct template reference&lt;Converter, TypeOut, void&gt;">reference</a><span class="special">&lt;</span><span class="identifier">Converter</span><span class="special">,</span> <span class="identifier">TypeOut</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;</span><span class="special">;</span>
  77     <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">,</span> <span class="keyword">typename</span> Converter<span class="special">&gt;</span>
  78       <a class="link" href="boost/cnv/reference.html" title="Struct template reference">reference</a><span class="special">&lt;</span> <span class="identifier">Converter</span><span class="special">,</span> <span class="identifier">TypeOut</span><span class="special">,</span> <span class="identifier">TypeIn</span> <span class="special">&gt;</span> <a class="link" href="boost/cnv/apply_idm45211508372640.html" title="Function template apply"><span class="identifier">apply</span></a><span class="special">(</span><span class="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  79     <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> Converter<span class="special">&gt;</span>
  80       <a class="link" href="boost/cnv/reference.html" title="Struct template reference">reference</a><span class="special">&lt;</span> <span class="identifier">Converter</span><span class="special">,</span> <span class="identifier">TypeOut</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">&gt;</span> <a name="boost.cnv.apply_idm45211508367152"></a><span class="identifier">apply</span><span class="special">(</span><span class="identifier">Converter</span> <span class="keyword">const</span> <span class="special">&amp;</span> cnv<span class="special">)</span><span class="special">;</span>
  81   <span class="special">}</span>
  82 <span class="special">}</span></pre>
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  88         Distributed under the Boost Software License, Version 1.0. See copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>.
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