| |
| // (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 |