//  © Copyright Fernando Luis Cacciola Carballal 2000-2004

 //  Use, modification, and distribution is subject to the Boost Software

 //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

 //  http://www.boost.org/LICENSE_1_0.txt)

 //  See library home page at http://www.boost.org/libs/numeric/conversion

 //

 // Contact the author at: fernando_cacciola@hotmail.com

 // 

 #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP

 #define BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP

 #include "boost/type_traits/is_arithmetic.hpp"

 #include "boost/numeric/conversion/udt_builtin_mixture_enum.hpp"

 #include "boost/numeric/conversion/detail/meta.hpp"

 #include "boost/mpl/integral_c.hpp"

 namespace boost { namespace numeric { namespace convdetail

 {

   // Integral Constants for 'UdtMixture'

   typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_builtin> builtin2builtin_c ;

   typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_udt>     builtin2udt_c ;

   typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_builtin>     udt2builtin_c ;

   typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_udt>         udt2udt_c ;

   // Metafunction:

   //

   //   for_udt_mixture<UdtMixture,BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt>::type

   //

   // {UdtMixture} is one of the Integral Constants for UdMixture, declared above.

   // {BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt} are aribtrary types. (not metafunctions)

   //

   // According to the value of 'UdtMixture', selects the corresponding type.

   //

   template<class UdtMixture, class BuiltIn2BuiltIn, class BuiltIn2Udt, class Udt2BuiltIn, class Udt2Udt>

   struct for_udt_builtin_mixture

   {

     typedef typename

       ct_switch4<UdtMixture

                  , builtin2builtin_c, builtin2udt_c, udt2builtin_c // default

                  , BuiltIn2BuiltIn  , BuiltIn2Udt  , Udt2BuiltIn  , Udt2Udt

                 >::type

         type ;

   } ;

   // Metafunction:

   //

   //   get_udt_mixture<T,S>::type

   //

   // Selects the appropriate UdtMixture Integral Constant for the combination T,S.

   //

   template<class T,class S>

   struct get_udt_builtin_mixture

   {

     typedef is_arithmetic<S> S_builtin ;

     typedef is_arithmetic<T> T_builtin ;

     typedef typename

       for_both<S_builtin, T_builtin, builtin2builtin_c, builtin2udt_c, udt2builtin_c, udt2udt_c>::type

         type ;

   } ;

 } } } // namespace boost::numeric::convdetail

 #endif