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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.is_detected_exact"></a><a class="link" href="is_detected_exact.html" title="is_detected_exact">is_detected_exact</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Expected</span><span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span><span class="special">...&gt;</span> <span class="keyword">class</span> <span class="identifier">Op</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="keyword">using</span> <span class="identifier">is_detected_exact</span> <span class="special">=</span> <span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">Expected</span><span class="special">,</span> <span class="identifier">detected_t</span><span class="special">&lt;</span><span class="identifier">Op</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">...&gt;</span> <span class="special">&gt;;</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Expected</span><span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span><span class="special">...&gt;</span> <span class="keyword">class</span> <span class="identifier">Op</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_detected_exact_v</span> <span class="special">=</span> <span class="identifier">is_detected_exact</span><span class="special">&lt;</span><span class="identifier">Op</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">...&gt;::</span><span class="identifier">value</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>C++ Standard Paper:</strong></span> <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf" target="_top">N4502</a>
      </p>
<p>
        <span class="bold"><strong>Compiler Compatibility:</strong></span> Requires C++11 variadic
        templates and C++11 template aliases.
      </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_detected_exact</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
      </p>
<p>
        The type <code class="computeroutput"><span class="identifier">is_detected_exact</span><span class="special">&lt;</span><span class="identifier">To</span><span class="special">,</span> <span class="identifier">Op</span><span class="special">,</span>
        <span class="identifier">Args</span><span class="special">&gt;</span></code>
        is an alias for <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>
        if the result of <code class="computeroutput"><span class="identifier">Op</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">&gt;</span></code>
        is type <code class="computeroutput"><span class="identifier">To</span></code>. Otherwise it's
        the type <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>;
      </p>
<p>
        <span class="bold"><strong>Examples:</strong></span>
      </p>
<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">using</span> <span class="identifier">difference_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">::</span><span class="identifier">difference_type</span><span class="special">;</span>

<span class="keyword">static_assert</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_detected_exact_v</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span><span class="special">,</span> <span class="identifier">difference_t</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;);</span>
</pre>
<p>
        See also: <a class="link" href="is_detected.html" title="is_detected">is_detected</a>,
        <a class="link" href="is_detected_convertible.html" title="is_detected_convertible">is_detected_convertible</a>.
      </p>
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