1 2 // (C) Copyright Edward Diener 2011,2012,2013 3 // Use, modification and distribution are subject to the Boost Software License, 4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt). 6 7 #if !defined(BOOST_TTI_DETAIL_TEMPLATE_HPP) 8 #define BOOST_TTI_DETAIL_TEMPLATE_HPP 9 10 #include <boost/config.hpp> 11 #include <boost/mpl/bool.hpp> 12 #include <boost/mpl/eval_if.hpp> 13 #include <boost/mpl/has_xxx.hpp> 14 #include <boost/preprocessor/cat.hpp> 15 #include <boost/preprocessor/debug/assert.hpp> 16 #include <boost/preprocessor/facilities/is_empty.hpp> 17 #include <boost/type_traits/is_class.hpp> 18 19 #define BOOST_TTI_DETAIL_IS_HELPER_BOOST_PP_NIL 20 21 #define BOOST_TTI_DETAIL_IS_NIL(param) \ 22 BOOST_PP_IS_EMPTY \ 23 ( \ 24 BOOST_PP_CAT(BOOST_TTI_DETAIL_IS_HELPER_,param) \ 25 ) \ 26 /**/ 27 28 #define BOOST_TTI_DETAIL_TRAIT_ASSERT_NOT_NIL(trait,name,params) \ 29 BOOST_PP_ASSERT_MSG(0, "The parameter must be BOOST_PP_NIL") \ 30 /**/ 31 32 #define BOOST_TTI_DETAIL_TRAIT_CHECK_IS_NIL(trait,name,params) \ 33 BOOST_PP_IIF \ 34 ( \ 35 BOOST_TTI_DETAIL_IS_NIL(params), \ 36 BOOST_TTI_DETAIL_TRAIT_HAS_TEMPLATE, \ 37 BOOST_TTI_DETAIL_TRAIT_ASSERT_NOT_NIL \ 38 ) \ 39 (trait,name,params) \ 40 /**/ 41 42 #define BOOST_TTI_DETAIL_TRAIT_HAS_TEMPLATE_THT(trait,name) \ 43 BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(BOOST_PP_CAT(trait,_detail_mpl), name, false) \ 44 template<class BOOST_TTI_DETAIL_TP_T> \ 45 struct BOOST_PP_CAT(trait,_tht) : \ 46 BOOST_PP_CAT(trait,_detail_mpl)<BOOST_TTI_DETAIL_TP_T> \ 47 { \ 48 }; \ 49 /**/ 50 51 #define BOOST_TTI_DETAIL_TRAIT_HAS_TEMPLATE(trait,name,params) \ 52 BOOST_TTI_DETAIL_TRAIT_HAS_TEMPLATE_THT(trait,name) \ 53 template<class BOOST_TTI_DETAIL_TP_T> \ 54 struct trait \ 55 { \ 56 typedef typename \ 57 boost::mpl::eval_if \ 58 < \ 59 boost::is_class<BOOST_TTI_DETAIL_TP_T>, \ 60 BOOST_PP_CAT(trait,_tht)<BOOST_TTI_DETAIL_TP_T>, \ 61 boost::mpl::false_ \ 62 >::type type; \ 63 BOOST_STATIC_CONSTANT(bool,value=type::value); \ 64 }; \ 65 /**/ 66 67 #endif // !BOOST_TTI_DETAIL_TEMPLATE_HPP 68