73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
// (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
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|