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<h2><span class="refentrytitle">Macro BOOST_TTI_HAS_FUNCTION_TEMPLATE</span></h2>
<p>BOOST_TTI_HAS_FUNCTION_TEMPLATE — A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="header/boost/tti/has_function_template_hpp.html" title="Header &lt;boost/tti/has_function_template.hpp&gt;">boost/tti/has_function_template.hpp</a>&gt;
</span>BOOST_TTI_HAS_FUNCTION_TEMPLATE(name, ...)</pre></div>
<div class="refsect1">
<a name="idm46191514243392"></a><h2>Description</h2>
<p>BOOST_TTI__HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction. The metafunction tests whether an inner member function template or static member function template with a particular name exists. The macro takes the form of BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,...) where</p>
<p>name = inner member function template or static member function template name <br>
... = variadic parameters.</p>
<p>The variadic parameter(s) are either:</p>
<p>A sequence of valid instantiations for the static member function template parameters ie. 'int,long,double' etc.</p>
<p>or</p>
<p>A single variadic parameter which is a Boost PP array whose elements are a sequence of valid instantiations for the static member function template parameters ie. '(3,(int,long,double))' etc. This form is allowed in order to be compatible with using the non-variadic form of this macro.</p>
<p>BOOST_TTI_HAS_FUNCTION_TEMPLATE generates a metafunction called "has_function_template_'name'" where 'name' is the first macro parameter.</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TP_T</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_R</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_FS</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TAG</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">has_function_template_</span><span class="char">'name'</span>
<span class="special">{</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">unspecified</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special">&lt;</span><span class="keyword">true</span><span class="special">-</span><span class="identifier">or</span><span class="special">-</span><span class="keyword">false</span><span class="special">&gt;</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="identifier">The</span> <span class="identifier">metafunction</span> <span class="identifier">types</span> <span class="identifier">and</span> <span class="keyword">return</span><span class="special">:</span>
<span class="identifier">BOOST_TTI_TP_T</span> <span class="special">=</span> <span class="identifier">the</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">in</span> <span class="identifier">which</span> <span class="identifier">to</span> <span class="identifier">look</span> <span class="keyword">for</span> <span class="identifier">our</span> <span class="char">'name'</span><span class="special">.</span>
<span class="identifier">The</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">can</span> <span class="identifier">be</span> <span class="identifier">a</span> <span class="keyword">class</span><span class="special">,</span> <span class="keyword">struct</span><span class="special">,</span> <span class="identifier">or</span> <span class="keyword">union</span><span class="special">.</span>
<span class="identifier">BOOST_TTI_TP_R</span> <span class="special">=</span> <span class="identifier">the</span> <span class="keyword">return</span> <span class="identifier">type</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span>
<span class="identifier">in</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">instantiation</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span>
<span class="identifier">BOOST_TTI_TP_FS</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">optional</span><span class="special">)</span> <span class="identifier">the</span> <span class="identifier">parameters</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">as</span> <span class="identifier">a</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span> <span class="identifier">forward</span> <span class="identifier">sequence</span>
<span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">parameters</span> <span class="identifier">are</span> <span class="identifier">not</span> <span class="identifier">empty</span><span class="special">.</span> <span class="identifier">These</span> <span class="identifier">parameters</span> <span class="identifier">are</span> <span class="identifier">a</span> <span class="identifier">single</span>
<span class="identifier">instantiation</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span><span class="special">.</span>
<span class="identifier">BOOST_TTI_TP_TAG</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">optional</span><span class="special">)</span> <span class="identifier">a</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_types</span> <span class="identifier">tag</span> <span class="identifier">to</span> <span class="identifier">apply</span> <span class="identifier">to</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span>
<span class="keyword">if</span> <span class="identifier">a</span> <span class="identifier">tag</span> <span class="identifier">is</span> <span class="identifier">needed</span><span class="special">.</span>
<span class="identifier">returns</span> <span class="special">=</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">true</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="char">'name'</span> <span class="identifier">exists</span><span class="special">,</span>
<span class="identifier">with</span> <span class="identifier">the</span> <span class="identifier">appropriate</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">or</span> <span class="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">type</span><span class="special">,</span>
<span class="identifier">otherwise</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">false</span><span class="special">.</span>
</pre>
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