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<title>is_nothrow_swappable</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.is_nothrow_swappable"></a><a class="link" href="is_nothrow_swappable.html" title="is_nothrow_swappable">is_nothrow_swappable</a>
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<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>
<span class="keyword">struct</span> <span class="identifier">is_nothrow_swappable</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>
</pre>
<p>
        <span class="bold"><strong>Inherits:</strong></span> If the expression <code class="computeroutput"><span class="identifier">swap</span><span class="special">(</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;(),</span>
        <span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;())</span></code>
        (in a context where <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">swap</span></code> is visible) is valid and non-throwing,
        inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
        otherwise from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
      </p>
<p>
        <span class="bold"><strong>Compiler Compatibility:</strong></span> This trait requires
        C++11 for full support. Without C++11 it will inherit from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>
        for scalar types (including integral, floating point, enumeration, pointer
        and pointer-to-member types), and from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>
        for anything else.
      </p>
<p>
        <span class="bold"><strong>Header:</strong></span> <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">is_nothrow_swappable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
        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>
      </p>
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