Jeff Thompson | ef2d5a4 | 2013-08-22 19:09:24 -0700 | [diff] [blame] | 1 | // (c) Copyright Fernando Luis Cacciola Carballal 2000-2004 |
| 2 | // Use, modification, and distribution is subject to the Boost Software |
| 3 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | // See library home page at http://www.boost.org/libs/numeric/conversion |
| 7 | // |
| 8 | // Contact the author at: fernando_cacciola@hotmail.com |
| 9 | // |
| 10 | #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP |
| 11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP |
| 12 | |
| 13 | #include "ndnboost/type_traits/is_arithmetic.hpp" |
| 14 | #include "ndnboost/type_traits/is_same.hpp" |
| 15 | #include "ndnboost/type_traits/remove_cv.hpp" |
| 16 | |
| 17 | #include "ndnboost/numeric/conversion/detail/meta.hpp" |
| 18 | #include "ndnboost/numeric/conversion/detail/int_float_mixture.hpp" |
| 19 | #include "ndnboost/numeric/conversion/detail/sign_mixture.hpp" |
| 20 | #include "ndnboost/numeric/conversion/detail/udt_builtin_mixture.hpp" |
| 21 | #include "ndnboost/numeric/conversion/detail/is_subranged.hpp" |
| 22 | |
| 23 | namespace ndnboost { namespace numeric { namespace convdetail |
| 24 | { |
| 25 | //------------------------------------------------------------------- |
| 26 | // Implementation of the Conversion Traits for T != S |
| 27 | // |
| 28 | // This is a VISIBLE base class of the user-level conversion_traits<> class. |
| 29 | //------------------------------------------------------------------- |
| 30 | template<class T,class S> |
| 31 | struct non_trivial_traits_impl |
| 32 | { |
| 33 | typedef typename get_int_float_mixture <T,S>::type int_float_mixture ; |
| 34 | typedef typename get_sign_mixture <T,S>::type sign_mixture ; |
| 35 | typedef typename get_udt_builtin_mixture <T,S>::type udt_builtin_mixture ; |
| 36 | |
| 37 | typedef typename get_is_subranged<T,S>::type subranged ; |
| 38 | |
| 39 | typedef mpl::false_ trivial ; |
| 40 | |
| 41 | typedef T target_type ; |
| 42 | typedef S source_type ; |
| 43 | typedef T result_type ; |
| 44 | |
| 45 | typedef typename mpl::if_< is_arithmetic<S>, S, S const&>::type argument_type ; |
| 46 | |
| 47 | typedef typename mpl::if_<subranged,S,T>::type supertype ; |
| 48 | typedef typename mpl::if_<subranged,T,S>::type subtype ; |
| 49 | } ; |
| 50 | |
| 51 | //------------------------------------------------------------------- |
| 52 | // Implementation of the Conversion Traits for T == S |
| 53 | // |
| 54 | // This is a VISIBLE base class of the user-level conversion_traits<> class. |
| 55 | //------------------------------------------------------------------- |
| 56 | template<class N> |
| 57 | struct trivial_traits_impl |
| 58 | { |
| 59 | typedef typename get_int_float_mixture <N,N>::type int_float_mixture ; |
| 60 | typedef typename get_sign_mixture <N,N>::type sign_mixture ; |
| 61 | typedef typename get_udt_builtin_mixture<N,N>::type udt_builtin_mixture ; |
| 62 | |
| 63 | typedef mpl::false_ subranged ; |
| 64 | typedef mpl::true_ trivial ; |
| 65 | |
| 66 | typedef N target_type ; |
| 67 | typedef N source_type ; |
| 68 | typedef N const& result_type ; |
| 69 | typedef N const& argument_type ; |
| 70 | |
| 71 | typedef N supertype ; |
| 72 | typedef N subtype ; |
| 73 | |
| 74 | } ; |
| 75 | |
| 76 | //------------------------------------------------------------------- |
| 77 | // Top level implementation selector. |
| 78 | //------------------------------------------------------------------- |
| 79 | template<class T, class S> |
| 80 | struct get_conversion_traits |
| 81 | { |
| 82 | typedef typename remove_cv<T>::type target_type ; |
| 83 | typedef typename remove_cv<S>::type source_type ; |
| 84 | |
| 85 | typedef typename is_same<target_type,source_type>::type is_trivial ; |
| 86 | |
| 87 | typedef trivial_traits_impl <target_type> trivial_imp ; |
| 88 | typedef non_trivial_traits_impl<target_type,source_type> non_trivial_imp ; |
| 89 | |
| 90 | typedef typename mpl::if_<is_trivial,trivial_imp,non_trivial_imp>::type type ; |
| 91 | } ; |
| 92 | |
| 93 | } } } // namespace ndnboost::numeric::convdetail |
| 94 | |
| 95 | #endif |
| 96 | |
| 97 | |