// (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 | |
// | |
/////////////////////////////////////////////////////////////////////////////////////////////// | |