// (c) 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 // ///////////////////////////////////////////////////////////////////////////////////////////////