//  © 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_SIGN_MIXTURE_FLC_12NOV2002_HPP

 #define BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP

 #include "boost/config.hpp"

 #include "boost/limits.hpp"

 #include "boost/numeric/conversion/sign_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 'SignMixture'

   typedef mpl::integral_c<sign_mixture_enum, unsigned_to_unsigned> unsig2unsig_c ;

   typedef mpl::integral_c<sign_mixture_enum, signed_to_signed>     sig2sig_c ;

   typedef mpl::integral_c<sign_mixture_enum, signed_to_unsigned>   sig2unsig_c ;

   typedef mpl::integral_c<sign_mixture_enum, unsigned_to_signed>   unsig2sig_c ;

   // Metafunction:

   //

   //   get_sign_mixture<T,S>::type

   //

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

   //

   template<class T,class S>

   struct get_sign_mixture

   {

     typedef mpl::bool_< ::std::numeric_limits<S>::is_signed > S_signed ;

     typedef mpl::bool_< ::std::numeric_limits<T>::is_signed > T_signed ;

     typedef typename

       for_both<S_signed, T_signed, sig2sig_c, sig2unsig_c, unsig2sig_c, unsig2unsig_c>::type

         type ;

   } ;

   // Metafunction:

   //

   //   for_sign_mixture<SignMixture,Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig>::type

   //

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

   // {Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig} are aribtrary types. (not metafunctions)

   //

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

   //

   template<class SignMixture, class Sig2Sig, class Sig2Unsig, class Unsig2Sig, class Unsig2Unsig>

   struct for_sign_mixture

   {

     typedef typename

       ct_switch4<SignMixture

                  , sig2sig_c, sig2unsig_c, unsig2sig_c  // default

                  , Sig2Sig  , Sig2Unsig  , Unsig2Sig  , Unsig2Unsig

                 >::type

         type ;

   } ;

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

 #endif

 //

 ///////////////////////////////////////////////////////////////////////////////////////////////