Chris@16: //  (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
Chris@16: //  Use, modification, and distribution is subject to the Boost Software
Chris@16: //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See library home page at http://www.boost.org/libs/numeric/conversion
Chris@16: //
Chris@16: // Contact the author at: fernando_cacciola@hotmail.com
Chris@16: // 
Chris@16: #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
Chris@16: #define BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
Chris@16: 
Chris@16: #include "boost/config.hpp"
Chris@16: #include "boost/limits.hpp"
Chris@16: 
Chris@16: #include "boost/numeric/conversion/sign_mixture_enum.hpp"
Chris@16: #include "boost/numeric/conversion/detail/meta.hpp"
Chris@16: 
Chris@16: #include "boost/mpl/integral_c.hpp"
Chris@16: 
Chris@16: namespace boost { namespace numeric { namespace convdetail
Chris@16: {
Chris@16:   // Integral Constants for 'SignMixture'
Chris@16:   typedef mpl::integral_c<sign_mixture_enum, unsigned_to_unsigned> unsig2unsig_c ;
Chris@16:   typedef mpl::integral_c<sign_mixture_enum, signed_to_signed>     sig2sig_c ;
Chris@16:   typedef mpl::integral_c<sign_mixture_enum, signed_to_unsigned>   sig2unsig_c ;
Chris@16:   typedef mpl::integral_c<sign_mixture_enum, unsigned_to_signed>   unsig2sig_c ;
Chris@16: 
Chris@16:   // Metafunction:
Chris@16:   //
Chris@16:   //   get_sign_mixture<T,S>::type
Chris@16:   //
Chris@16:   // Selects the appropriate SignMixture Integral Constant for the combination T,S.
Chris@16:   //
Chris@16:   template<class T,class S>
Chris@16:   struct get_sign_mixture
Chris@16:   {
Chris@16:     typedef mpl::bool_< ::std::numeric_limits<S>::is_signed > S_signed ;
Chris@16:     typedef mpl::bool_< ::std::numeric_limits<T>::is_signed > T_signed ;
Chris@16: 
Chris@16:     typedef typename
Chris@16:       for_both<S_signed, T_signed, sig2sig_c, sig2unsig_c, unsig2sig_c, unsig2unsig_c>::type
Chris@16:         type ;
Chris@16:   } ;
Chris@16: 
Chris@16:   // Metafunction:
Chris@16:   //
Chris@16:   //   for_sign_mixture<SignMixture,Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig>::type
Chris@16:   //
Chris@16:   // {SignMixture} is one of the Integral Constants for SignMixture, declared above.
Chris@16:   // {Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig} are aribtrary types. (not metafunctions)
Chris@16:   //
Chris@16:   // According to the value of 'SignMixture', selects the corresponding type.
Chris@16:   //
Chris@16:   template<class SignMixture, class Sig2Sig, class Sig2Unsig, class Unsig2Sig, class Unsig2Unsig>
Chris@16:   struct for_sign_mixture
Chris@16:   {
Chris@16:     typedef typename
Chris@16:       ct_switch4<SignMixture
Chris@16:                  , sig2sig_c, sig2unsig_c, unsig2sig_c  // default
Chris@16:                  , Sig2Sig  , Sig2Unsig  , Unsig2Sig  , Unsig2Unsig
Chris@16:                 >::type
Chris@16:         type ;
Chris@16:   } ;
Chris@16: 
Chris@16: } } } // namespace boost::numeric::convdetail
Chris@16: 
Chris@16: #endif
Chris@16: //
Chris@16: ///////////////////////////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16: