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349 lines
14 KiB
C++
349 lines
14 KiB
C++
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// (C) Copyright Edward Diener 2011,2012
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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/*
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The succeeding comments in this file are in doxygen format.
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*/
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/** \file
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*/
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#if !defined(BOOST_TTI_HAS_TEMPLATE_HPP)
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#define BOOST_TTI_HAS_TEMPLATE_HPP
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#include <boost/config.hpp>
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#include <boost/tti/gen/has_template_gen.hpp>
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#include <boost/preprocessor/config/config.hpp>
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#include <boost/preprocessor/control/iif.hpp>
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#if BOOST_PP_VARIADICS
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#include <boost/preprocessor/comparison/equal.hpp>
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#include <boost/preprocessor/variadic/elem.hpp>
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#include <boost/preprocessor/variadic/size.hpp>
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#include <boost/tti/detail/dvm_template_params.hpp>
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/// Expands to a metafunction which tests whether an inner class template with a particular name exists.
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/**
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trait = the name of the metafunction.
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... = variadic parameters.
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The first variadic parameter is the inner class template name.
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Following variadic parameters are optional.
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If no following variadic parameters exist, then the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur.
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If the second variadic parameter is BOOST_PP_NIL and no other variadic
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parameter is given, then just as in the previous case the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur. This form is allowed in order to be consistent with using the
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non-variadic form of this macro.
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If the second variadic parameter is a Boost preprocessor library array and no other
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variadic parameter is given, then the inner class template must have its template
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parameters matching the sequence in the tuple portion of the Boost PP array. This
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form is allowed in order to be consistent with using the non-variadic form of this
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macro.
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Otherwise the inner class template must have its template parameters matching the
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sequence of the optional variadic parameters.
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generates a metafunction called "trait" where 'trait' is the first macro parameter.
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template<class BOOST_TTI_TP_T>
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struct trait
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
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returns = 'value' is true if the 'name' template exists within the enclosing type,
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otherwise 'value' is false.
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Examples:
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1) Search for an inner class template called 'MyTemplate', with all template type parameters,
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nested within the class 'MyClass' using a metafunction name of 'MyMeta'.
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate)
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or
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate,BOOST_PP_NIL) // Non-variadic macro form
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MyMeta<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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2) Search for an inner class template called 'MyTemplate', with template parameters
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of 'class T,int x,template<class> class U', nested within the class 'MyClass'
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using a metafunction name of 'MyMeta'.
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate,class,int,template<class> class)
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or
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate,(3,(class,int,template<class> class))) // Non-variadic macro form
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MyMeta<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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*/
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#define BOOST_TTI_TRAIT_HAS_TEMPLATE(trait,...) \
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BOOST_PP_IIF \
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( \
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BOOST_PP_EQUAL \
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( \
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BOOST_PP_VARIADIC_SIZE(__VA_ARGS__), \
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1 \
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), \
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BOOST_TTI_DETAIL_VM_TRAIT_HAS_TEMPLATE, \
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BOOST_TTI_DETAIL_VM_CHECK_MORE_THAN_TWO \
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) \
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(trait,__VA_ARGS__) \
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/**/
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/// Expands to a metafunction which tests whether an inner class template with a particular name exists.
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/**
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... = variadic parameters.
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The first variadic parameter is the inner class template name.
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Following variadic parameters are optional.
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If no following variadic parameters exist, then the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur.
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If the second variadic parameter is BOOST_PP_NIL and no other variadic
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parameter is given, then just as in the previous case the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur. This form is allowed in order to be consistent with using the
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non-variadic form of this macro.
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If the second variadic parameter is a Boost preprocessor library array and no other
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variadic parameter is given, then the inner class template must have its template
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parameters matching the sequence in the tuple portion of the Boost PP array. This
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form is allowed in order to be consistent with using the non-variadic form of this
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macro.
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Otherwise the inner class template must have its template parameters matching the
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sequence of the optional variadic parameters.
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generates a metafunction called "has_template_'name'" where 'name' is the first variadic parameter.
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template<class BOOST_TTI_TP_T>
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struct has_template_'name'
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
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returns = 'value' is true if the 'name' template exists within the enclosing type,
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otherwise 'value' is false.
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Examples:
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1) Search for an inner class template called 'MyTemplate', with all template type parameters,
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nested within the class 'MyClass'.
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BOOST_TTI_HAS_TEMPLATE(MyTemplate)
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or
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BOOST_TTI_HAS_TEMPLATE(MyTemplate,BOOST_PP_NIL) // Non-variadic macro form
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has_template_MyTemplate<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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2) Search for an inner class template called 'MyTemplate' with template parameters
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of 'class T,int x,template<class> class U' nested within the class 'MyClass'.
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BOOST_TTI_HAS_TEMPLATE(MyTemplate,class,int,template<class> class)
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or
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BOOST_TTI_HAS_TEMPLATE(MyTemplate,(3,(class,int,template<class> class))) // Non-variadic macro form
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has_template_MyTemplate<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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*/
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#define BOOST_TTI_HAS_TEMPLATE(...) \
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BOOST_TTI_TRAIT_HAS_TEMPLATE \
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( \
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BOOST_TTI_HAS_TEMPLATE_GEN \
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( \
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BOOST_PP_VARIADIC_ELEM(0,__VA_ARGS__) \
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), \
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__VA_ARGS__ \
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) \
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/**/
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#else // !BOOST_PP_VARIADICS
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#include <boost/preprocessor/detail/is_binary.hpp>
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#include <boost/tti/detail/dtemplate.hpp>
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#include <boost/tti/detail/dtemplate_params.hpp>
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/// Expands to a metafunction which tests whether an inner class template with a particular name exists.
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/**
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trait = the name of the metafunction.
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name = the inner class template name.
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params = If the parameter is BOOST_PP_NIL the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur.
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If the parameter is a Boost preprocessor library array, then the inner class
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template must have its template parameters matching the sequence in the tuple portion
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of the Boost PP array.
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Otherwise a compiler error occurs.
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generates a metafunction called "trait" where 'trait' is the first macro parameter.
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template<class BOOST_TTI_TP_T>
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struct trait
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
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returns = 'value' is true if the 'name' template exists within the enclosing type,
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otherwise 'value' is false.
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Examples:
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1) Search for an inner class template called 'MyTemplate', with all template type parameters,
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nested within the class 'MyClass' using a metafunction name of 'MyMeta'.
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate,BOOST_PP_NIL)
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MyMeta<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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2) Search for an inner class template called 'MyTemplate', with template parameters
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of 'class T,int x,template<class> class U', nested within the class 'MyClass'
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using a metafunction name of 'MyMeta'.
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BOOST_TTI_TRAIT_HAS_TEMPLATE(MyMeta,MyTemplate,(3,(class,int,template<class> class)))
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MyMeta<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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*/
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#define BOOST_TTI_TRAIT_HAS_TEMPLATE(trait,name,params) \
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BOOST_PP_IIF \
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( \
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BOOST_PP_IS_BINARY(params), \
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BOOST_TTI_DETAIL_TRAIT_HAS_TEMPLATE_CHECK_PARAMS, \
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BOOST_TTI_DETAIL_TRAIT_CHECK_IS_NIL \
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) \
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(trait,name,params) \
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/**/
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/// Expands to a metafunction which tests whether an inner class template with a particular name exists.
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/**
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name = the inner class template name.
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params = If the parameter is BOOST_PP_NIL the inner class template
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being introspected must be all template type parameters ( template parameters
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starting with `class` or `typename` ) and any number of template type parameters
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can occur.
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If the parameter is a Boost preprocessor library array, then the inner class
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template must have its template parameters matching the sequence in the tuple portion
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of the Boost PP array.
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Otherwise a compiler error occurs.
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generates a metafunction called "has_template_'name'" where 'name' is the first macro parameter.
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template<class BOOST_TTI_TP_T>
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struct trait
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
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returns = 'value' is true if the 'name' template exists within the enclosing type,
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otherwise 'value' is false.
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Examples:
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1) Search for an inner class template called 'MyTemplate', with all template type parameters,
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nested within the class 'MyClass'.
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BOOST_TTI_HAS_TEMPLATE(MyTemplate,BOOST_PP_NIL)
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has_template_MyTemplate<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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2) Search for an inner class template called 'MyTemplate' with template parameters
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of 'class T,int x,template<class> class U' nested within the class 'MyClass'.
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BOOST_TTI_HAS_TEMPLATE(MyTemplate,(3,(class,int,template<class> class)))
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has_template_MyTemplate<MyClass>::value
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is a compile time boolean constant which is either 'true' or 'false'
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if the nested template exists.
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*/
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#define BOOST_TTI_HAS_TEMPLATE(name,params) \
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BOOST_TTI_TRAIT_HAS_TEMPLATE \
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( \
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BOOST_TTI_HAS_TEMPLATE_GEN(name), \
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name, \
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params \
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) \
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/**/
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#endif // BOOST_PP_VARIADICS
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#endif // BOOST_TTI_HAS_TEMPLATE_HPP
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