[3428] | 1 | // (c) Copyright Fernando Luis Cacciola Carballal 2000-2004 |
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| 2 | // Use, modification, and distribution is subject to the Boost Software |
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| 3 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | // See library home page at http://www.boost.org/libs/numeric/conversion |
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| 7 | // |
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| 8 | // Contact the author at: fernando_cacciola@hotmail.com |
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| 9 | // |
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| 10 | #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP |
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| 11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP |
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| 12 | |
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| 13 | #include "boost/type_traits/is_arithmetic.hpp" |
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| 14 | #include "boost/type_traits/is_same.hpp" |
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| 15 | #include "boost/type_traits/remove_cv.hpp" |
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| 16 | |
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| 17 | #include "boost/numeric/conversion/detail/meta.hpp" |
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| 18 | #include "boost/numeric/conversion/detail/int_float_mixture.hpp" |
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| 19 | #include "boost/numeric/conversion/detail/sign_mixture.hpp" |
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| 20 | #include "boost/numeric/conversion/detail/udt_builtin_mixture.hpp" |
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| 21 | #include "boost/numeric/conversion/detail/is_subranged.hpp" |
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| 22 | |
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| 23 | namespace boost { namespace numeric { namespace convdetail |
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| 24 | { |
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| 25 | //------------------------------------------------------------------- |
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| 26 | // Implementation of the Conversion Traits for T != S |
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| 27 | // |
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| 28 | // This is a VISIBLE base class of the user-level conversion_traits<> class. |
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| 29 | //------------------------------------------------------------------- |
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| 30 | template<class T,class S> |
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| 31 | struct non_trivial_traits_impl |
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| 32 | { |
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| 33 | typedef typename get_int_float_mixture <T,S>::type int_float_mixture ; |
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| 34 | typedef typename get_sign_mixture <T,S>::type sign_mixture ; |
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| 35 | typedef typename get_udt_builtin_mixture <T,S>::type udt_builtin_mixture ; |
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| 36 | |
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| 37 | typedef typename get_is_subranged<T,S>::type subranged ; |
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| 38 | |
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| 39 | typedef mpl::false_ trivial ; |
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| 40 | |
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| 41 | typedef T target_type ; |
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| 42 | typedef S source_type ; |
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| 43 | typedef T result_type ; |
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| 44 | |
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| 45 | typedef typename mpl::if_< is_arithmetic<S>, S, S const&>::type argument_type ; |
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| 46 | |
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| 47 | typedef typename mpl::if_<subranged,S,T>::type supertype ; |
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| 48 | typedef typename mpl::if_<subranged,T,S>::type subtype ; |
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| 49 | } ; |
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| 50 | |
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| 51 | //------------------------------------------------------------------- |
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| 52 | // Implementation of the Conversion Traits for T == S |
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| 53 | // |
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| 54 | // This is a VISIBLE base class of the user-level conversion_traits<> class. |
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| 55 | //------------------------------------------------------------------- |
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| 56 | template<class N> |
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| 57 | struct trivial_traits_impl |
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| 58 | { |
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| 59 | typedef typename get_int_float_mixture <N,N>::type int_float_mixture ; |
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| 60 | typedef typename get_sign_mixture <N,N>::type sign_mixture ; |
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| 61 | typedef typename get_udt_builtin_mixture<N,N>::type udt_builtin_mixture ; |
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| 62 | |
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| 63 | typedef mpl::false_ subranged ; |
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| 64 | typedef mpl::true_ trivial ; |
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| 65 | |
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| 66 | typedef N target_type ; |
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| 67 | typedef N source_type ; |
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| 68 | typedef N const& result_type ; |
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| 69 | typedef N const& argument_type ; |
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| 70 | |
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| 71 | typedef N supertype ; |
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| 72 | typedef N subtype ; |
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| 73 | |
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| 74 | } ; |
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| 75 | |
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| 76 | //------------------------------------------------------------------- |
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| 77 | // Top level implementation selector. |
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| 78 | //------------------------------------------------------------------- |
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| 79 | template<class T, class S> |
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| 80 | struct get_conversion_traits |
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| 81 | { |
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| 82 | typedef typename remove_cv<T>::type target_type ; |
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| 83 | typedef typename remove_cv<S>::type source_type ; |
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| 84 | |
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| 85 | typedef typename is_same<target_type,source_type>::type is_trivial ; |
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| 86 | |
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| 87 | typedef trivial_traits_impl <target_type> trivial_imp ; |
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| 88 | typedef non_trivial_traits_impl<target_type,source_type> non_trivial_imp ; |
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| 89 | |
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| 90 | typedef typename mpl::if_<is_trivial,trivial_imp,non_trivial_imp>::type type ; |
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| 91 | } ; |
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| 92 | |
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| 93 | } } } // namespace boost::numeric::convdetail |
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| 94 | |
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| 95 | #endif |
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| 96 | |
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| 97 | |
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