williamr@2: //  © Copyright Fernando Luis Cacciola Carballal 2000-2004
williamr@2: //  Use, modification, and distribution is subject to the Boost Software
williamr@2: //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
williamr@2: //  http://www.boost.org/LICENSE_1_0.txt)
williamr@2: 
williamr@2: //  See library home page at http://www.boost.org/libs/numeric/conversion
williamr@2: //
williamr@2: // Contact the author at: fernando_cacciola@hotmail.com
williamr@2: // 
williamr@2: #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP
williamr@2: #define BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP
williamr@2: 
williamr@2: #include "boost/type_traits/is_arithmetic.hpp"
williamr@2: 
williamr@2: #include "boost/numeric/conversion/udt_builtin_mixture_enum.hpp"
williamr@2: #include "boost/numeric/conversion/detail/meta.hpp"
williamr@2: 
williamr@2: #include "boost/mpl/integral_c.hpp"
williamr@2: 
williamr@2: namespace boost { namespace numeric { namespace convdetail
williamr@2: {
williamr@2:   // Integral Constants for 'UdtMixture'
williamr@2:   typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_builtin> builtin2builtin_c ;
williamr@2:   typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_udt>     builtin2udt_c ;
williamr@2:   typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_builtin>     udt2builtin_c ;
williamr@2:   typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_udt>         udt2udt_c ;
williamr@2: 
williamr@2:   // Metafunction:
williamr@2:   //
williamr@2:   //   for_udt_mixture<UdtMixture,BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt>::type
williamr@2:   //
williamr@2:   // {UdtMixture} is one of the Integral Constants for UdMixture, declared above.
williamr@2:   // {BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt} are aribtrary types. (not metafunctions)
williamr@2:   //
williamr@2:   // According to the value of 'UdtMixture', selects the corresponding type.
williamr@2:   //
williamr@2:   template<class UdtMixture, class BuiltIn2BuiltIn, class BuiltIn2Udt, class Udt2BuiltIn, class Udt2Udt>
williamr@2:   struct for_udt_builtin_mixture
williamr@2:   {
williamr@2:     typedef typename
williamr@2:       ct_switch4<UdtMixture
williamr@2:                  , builtin2builtin_c, builtin2udt_c, udt2builtin_c // default
williamr@2:                  , BuiltIn2BuiltIn  , BuiltIn2Udt  , Udt2BuiltIn  , Udt2Udt
williamr@2:                 >::type
williamr@2:         type ;
williamr@2:   } ;
williamr@2: 
williamr@2:   // Metafunction:
williamr@2:   //
williamr@2:   //   get_udt_mixture<T,S>::type
williamr@2:   //
williamr@2:   // Selects the appropriate UdtMixture Integral Constant for the combination T,S.
williamr@2:   //
williamr@2:   template<class T,class S>
williamr@2:   struct get_udt_builtin_mixture
williamr@2:   {
williamr@2:     typedef is_arithmetic<S> S_builtin ;
williamr@2:     typedef is_arithmetic<T> T_builtin ;
williamr@2: 
williamr@2:     typedef typename
williamr@2:       for_both<S_builtin, T_builtin, builtin2builtin_c, builtin2udt_c, udt2builtin_c, udt2udt_c>::type
williamr@2:         type ;
williamr@2:   } ;
williamr@2: 
williamr@2: } } } // namespace boost::numeric::convdetail
williamr@2: 
williamr@2: #endif
williamr@2: 
williamr@2: