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- <h2><span class="refentrytitle">Macro BOOST_TTI_HAS_TEMPLATE</span></h2>
- <p>BOOST_TTI_HAS_TEMPLATE — Expands to a metafunction which tests whether an inner class template with a particular name exists. </p>
- </div>
- <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: <<a class="link" href="header/boost/tti/has_template_hpp.html" title="Header <boost/tti/has_template.hpp>">boost/tti/has_template.hpp</a>>
- </span>BOOST_TTI_HAS_TEMPLATE(...)</pre></div>
- <div class="refsect1">
- <a name="idm45456560412352"></a><h2>Description</h2>
- <p>... = variadic parameters. The first variadic parameter is the inner class template name.
- Following variadic parameters are optional.
- If no following variadic parameters exist, then the inner class template
- being introspected must be all template type parameters ( template parameters
- starting with `class` or `typename` ) and any number of template type parameters
- can occur.
- If the second variadic parameter is BOOST_PP_NIL and no other variadic
- parameter is given, then just as in the previous case the inner class template
- being introspected must be all template type parameters ( template parameters
- starting with `class` or `typename` ) and any number of template type parameters
- can occur. This form is allowed in order to be consistent with using the
- non-variadic form of this macro.
- If the second variadic parameter is a Boost preprocessor library array and no other
- variadic parameter is given, then the inner class template must have its template
- parameters matching the sequence in the tuple portion of the Boost PP array. This
- form is allowed in order to be consistent with using the non-variadic form of this
- macro.
- Otherwise the inner class template must have its template parameters matching the
- sequence of the optional variadic parameters.
- </p>
- <p>generates a metafunction called "has_template_'name'" where 'name' is the first variadic parameter. template<class BOOST_TTI_TP_T>
- struct has_template_'name'
- {
- static const value = unspecified;
- typedef mpl::bool_<true-or-false> type;
- };
- The metafunction types and return:
- BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
- returns = 'value' is true if the 'name' template exists within the enclosing type,
- otherwise 'value' is false.
- </p>
- <p>Examples:</p>
- <p>1) Search for an inner class template called 'MyTemplate', with all template type parameters, nested within the class 'MyClass'.</p>
- <p>BOOST_TTI_HAS_TEMPLATE(MyTemplate)</p>
- <p>or</p>
- <p>BOOST_TTI_HAS_TEMPLATE(MyTemplate,BOOST_PP_NIL) // Non-variadic macro form</p>
- <p>has_template_MyTemplate<MyClass>::value</p>
- <p>is a compile time boolean constant which is either 'true' or 'false' if the nested template exists.</p>
- <p>2) Search for an inner class template called 'MyTemplate' with template parameters of 'class T,int x,template<class> class U' nested within the class 'MyClass'.</p>
- <p>BOOST_TTI_HAS_TEMPLATE(MyTemplate,class,int,template<class> class)</p>
- <p>or</p>
- <p>BOOST_TTI_HAS_TEMPLATE(MyTemplate,(3,(class,int,template<class> class))) // Non-variadic macro form</p>
- <p>has_template_MyTemplate<MyClass>::value</p>
- <p>is a compile time boolean constant which is either 'true' or 'false' if the nested template exists. </p>
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