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- // (C) Copyright Edward Diener 2012,2013
- // Use, modification and distribution are subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt).
- #if !defined(BOOST_TTI_HAS_DATA_HPP)
- #define BOOST_TTI_HAS_DATA_HPP
- #include <boost/config.hpp>
- #include <boost/preprocessor/cat.hpp>
- #include <boost/type_traits/remove_const.hpp>
- #include <boost/tti/gen/has_data_gen.hpp>
- #include <boost/tti/detail/ddata.hpp>
- /*
- The succeeding comments in this file are in doxygen format.
- */
- /** \file
- */
- /// Expands to a metafunction which tests whether member data or static member with a particular name and type exists.
- /**
- trait = the name of the metafunction.
-
- name = the name of the inner member to introspect.
- generates a metafunction called "trait" where 'trait' is the macro parameter.
-
- template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE>
- struct trait
- {
- 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'
-
- BOOST_TTI_TP_TYPE = The type of the member data or static member.
-
- returns = 'value' is true if the 'name' exists, with the correct data type,
- otherwise 'value' is false.
-
- */
- #define BOOST_TTI_TRAIT_HAS_DATA(trait,name) \
- BOOST_TTI_DETAIL_TRAIT_HAS_DATA(trait,name) \
- template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE> \
- struct trait \
- { \
- typedef typename \
- BOOST_PP_CAT(trait,_detail_hd) \
- < \
- typename boost::remove_const<BOOST_TTI_TP_T>::type, \
- BOOST_TTI_TP_TYPE \
- >::type type; \
- BOOST_STATIC_CONSTANT(bool,value=type::value); \
- }; \
- /**/
- /// Expands to a metafunction which tests whether member data or static member data with a particular name and type exists.
- /**
- name = the name of the inner member.
- generates a metafunction called "has_data_name" where 'name' is the macro parameter.
-
- template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE>
- struct has_data_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'
-
- BOOST_TTI_TP_TYPE = The type of the member data or static member.
-
- returns = 'value' is true if the 'name' exists, with the correct data type,
- otherwise 'value' is false.
-
- */
- #define BOOST_TTI_HAS_DATA(name) \
- BOOST_TTI_TRAIT_HAS_DATA \
- ( \
- BOOST_TTI_HAS_DATA_GEN(name), \
- name \
- ) \
- /**/
- #endif // BOOST_TTI_HAS_DATA_HPP
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