1 /*-----------------------------------------------------------------------------+ 2 Copyright (c) 2008-2009: Joachim Faulhaber 3 +------------------------------------------------------------------------------+ 4 Distributed under the Boost Software License, Version 1.0. 5 (See accompanying file LICENCE.txt or copy at 6 http://www.boost.org/LICENSE_1_0.txt) 7 +-----------------------------------------------------------------------------*/ 8 #ifndef BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329 9 #define BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329 10 11 #include <boost/config.hpp> // For macro BOOST_STATIC_CONSTANT 12 #include <boost/mpl/has_xxx.hpp> 13 #include <boost/mpl/or.hpp> 14 #include <boost/mpl/and.hpp> 15 #include <boost/mpl/not.hpp> 16 #include <boost/type_traits/is_same.hpp> 17 #include <boost/icl/type_traits/no_type.hpp> 18 19 namespace boost{ namespace icl 20 { 21 namespace detail 22 { 23 BOOST_MPL_HAS_XXX_TRAIT_DEF(rep) 24 } 25 26 //-------------------------------------------------------------------------- 27 template <class Type> 28 struct has_rep_type 29 : mpl::bool_<detail::has_rep<Type>::value> 30 {}; 31 32 template <class Rep, class Type> 33 struct represents // Rep represents Type; Type is_wrapper_of Rep 34 : mpl::bool_<detail::has_rep<Type>::value> 35 { 36 typedef represents type; 37 BOOST_STATIC_CONSTANT(bool, 38 value = (mpl::and_< has_rep_type<Type> 39 , boost::is_same<typename Type::rep, Rep> >::value) 40 ); 41 }; 42 43 //-------------------------------------------------------------------------- 44 template <class Type, bool has_rep> 45 struct get_rep_type; 46 47 template <class Type> 48 struct get_rep_type<Type, false> 49 { 50 typedef no_type type; 51 }; 52 53 template <class Type> 54 struct get_rep_type<Type, true> 55 { 56 typedef typename Type::rep type; 57 }; 58 59 //-------------------------------------------------------------------------- 60 template<class Type> 61 struct rep_type_of 62 { 63 typedef typename 64 get_rep_type<Type, has_rep_type<Type>::value>::type type; 65 }; 66 67 }} // namespace boost icl 68 69 #endif 70