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  27 <a name="boost_typetraits.reference.has_nothrow_constructor"></a><a class="link" href="has_nothrow_constructor.html" title="has_nothrow_constructor">has_nothrow_constructor</a>
  28 </h3></div></div></div>
  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">has_nothrow_constructor</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
  32 <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>
  33 <span class="keyword">struct</span> <span class="identifier">has_nothrow_default_constructor</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>
  34 </pre>
  35 <p>
  36         <span class="bold"><strong>Inherits:</strong></span> If T is a (possibly cv-qualified)
  37         type with a non-throwing default-constructor then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
  38         otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
  39         Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
  40         type.
  41       </p>
  42 <p>
  43         These two traits are synonyms for each other.
  44       </p>
  45 <p>
  46         <span class="bold"><strong>Compiler Compatibility:</strong></span> Either requires
  47         C++11 <code class="computeroutput"><span class="keyword">noexcept</span></code> and <code class="computeroutput"><span class="keyword">decltype</span></code> or else some (unspecified) help from
  48         the compiler. Currently (June 2015) compilers more recent than Visual C++
  49         8, GCC-4.3, Greenhills 6.0, Intel-11.0, and Codegear and all recent GCC versions
  50         have the necessary compiler <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a>
  51         to ensure that this trait "just works". You may test to see if
  52         the necessary support is available by checking to see if <code class="computeroutput"><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_HAS_NOTHROW_CONSTRUCTOR</span><span class="special">)</span> <span class="special">||</span> <span class="special">(!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_CXX11_DECLTYPE</span><span class="special">)</span>
  53         <span class="special">&amp;&amp;</span> <span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_CXX11_NOEXCEPT</span><span class="special">))</span></code>
  54         is true.
  55       </p>
  56 <p>
  57         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  58         <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">has_nothrow_constructor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  59         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>
  60       </p>
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