williamr@4: //  © Copyright Fernando Luis Cacciola Carballal 2000-2004
williamr@4: //  Use, modification, and distribution is subject to the Boost Software
williamr@4: //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
williamr@4: //  http://www.boost.org/LICENSE_1_0.txt)
williamr@4: 
williamr@4: //  See library home page at http://www.boost.org/libs/numeric/conversion
williamr@4: //
williamr@4: // Contact the author at: fernando_cacciola@hotmail.com
williamr@4: // 
williamr@4: #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP
williamr@4: #define BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP
williamr@4: 
williamr@4: #include "boost/type_traits/is_arithmetic.hpp"
williamr@4: #include "boost/type_traits/is_same.hpp"
williamr@4: #include "boost/type_traits/remove_cv.hpp"
williamr@4: 
williamr@4: #include "boost/numeric/conversion/detail/meta.hpp"
williamr@4: #include "boost/numeric/conversion/detail/int_float_mixture.hpp"
williamr@4: #include "boost/numeric/conversion/detail/sign_mixture.hpp"
williamr@4: #include "boost/numeric/conversion/detail/udt_builtin_mixture.hpp"
williamr@4: #include "boost/numeric/conversion/detail/is_subranged.hpp"
williamr@4: 
williamr@4: namespace boost { namespace numeric { namespace convdetail
williamr@4: {
williamr@4:   //-------------------------------------------------------------------
williamr@4:   // Implementation of the Conversion Traits for T != S
williamr@4:   //
williamr@4:   // This is a VISIBLE base class of the user-level conversion_traits<> class.
williamr@4:   //-------------------------------------------------------------------
williamr@4:   template<class T,class S>
williamr@4:   struct non_trivial_traits_impl
williamr@4:   {
williamr@4:     typedef typename get_int_float_mixture   <T,S>::type int_float_mixture ;
williamr@4:     typedef typename get_sign_mixture        <T,S>::type sign_mixture ;
williamr@4:     typedef typename get_udt_builtin_mixture <T,S>::type udt_builtin_mixture ;
williamr@4: 
williamr@4:     typedef typename get_is_subranged<T,S>::type subranged ;
williamr@4: 
williamr@4:     typedef mpl::false_ trivial ;
williamr@4: 
williamr@4:     typedef T target_type ;
williamr@4:     typedef S source_type ;
williamr@4:     typedef T result_type ;
williamr@4: 
williamr@4:     typedef typename mpl::if_< is_arithmetic<S>, S, S const&>::type argument_type ;
williamr@4: 
williamr@4:     typedef typename mpl::if_<subranged,S,T>::type supertype ;
williamr@4:     typedef typename mpl::if_<subranged,T,S>::type subtype   ;
williamr@4:   } ;
williamr@4: 
williamr@4:   //-------------------------------------------------------------------
williamr@4:   // Implementation of the Conversion Traits for T == S
williamr@4:   //
williamr@4:   // This is a VISIBLE base class of the user-level conversion_traits<> class.
williamr@4:   //-------------------------------------------------------------------
williamr@4:   template<class N>
williamr@4:   struct trivial_traits_impl
williamr@4:   {
williamr@4:     typedef typename get_int_float_mixture  <N,N>::type int_float_mixture ;
williamr@4:     typedef typename get_sign_mixture       <N,N>::type sign_mixture ;
williamr@4:     typedef typename get_udt_builtin_mixture<N,N>::type udt_builtin_mixture ;
williamr@4: 
williamr@4:     typedef mpl::false_ subranged ;
williamr@4:     typedef mpl::true_  trivial ;
williamr@4: 
williamr@4:     typedef N        target_type ;
williamr@4:     typedef N        source_type ;
williamr@4:     typedef N const& result_type ;
williamr@4:     typedef N const& argument_type ;
williamr@4: 
williamr@4:     typedef N supertype ;
williamr@4:     typedef N subtype  ;
williamr@4: 
williamr@4:   } ;
williamr@4: 
williamr@4:   //-------------------------------------------------------------------
williamr@4:   // Top level implementation selector.
williamr@4:   //-------------------------------------------------------------------
williamr@4:   template<class T, class S>
williamr@4:   struct get_conversion_traits
williamr@4:   {
williamr@4:     typedef typename remove_cv<T>::type target_type ;
williamr@4:     typedef typename remove_cv<S>::type source_type ;
williamr@4: 
williamr@4:     typedef typename is_same<target_type,source_type>::type is_trivial ;
williamr@4: 
williamr@4:     typedef trivial_traits_impl    <target_type>             trivial_imp ;
williamr@4:     typedef non_trivial_traits_impl<target_type,source_type> non_trivial_imp ;
williamr@4: 
williamr@4:     typedef typename mpl::if_<is_trivial,trivial_imp,non_trivial_imp>::type type ;
williamr@4:   } ;
williamr@4: 
williamr@4: } } } // namespace boost::numeric::convdetail
williamr@4: 
williamr@4: #endif
williamr@4: 
williamr@4: