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  27 <a name="boost_typetraits.reference.is_default_constructible"></a><a class="link" href="is_default_constructible.html" title="is_default_constructible">is_default_constructible</a>
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  29 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
  30 <span class="keyword">struct</span> <span class="identifier">is_default_constructible</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
  31 </pre>
  32 <p>
  33         <span class="bold"><strong>Inherits:</strong></span> If <code class="computeroutput"><span class="identifier">T</span></code>
  34         can be default-constructed then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
  35         otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
  36         Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
  37         type.
  38       </p>
  39 <p>
  40         <span class="bold"><strong>Compiler Compatibility:</strong></span> This trait requires
  41         the C++11 feature <code class="computeroutput"><span class="keyword">decltype</span></code> support
  42         for full support. While there is some fallback code for cases where this
  43         is not the case, the trait should really be considered broken in that case.
  44       </p>
  45 <p>
  46         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  47         <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_copy_constructible</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  48         or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  49       </p>
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