// (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_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP | |
#define BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP | |
#include "boost/type_traits/is_arithmetic.hpp" | |
#include "boost/numeric/conversion/udt_builtin_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 'UdtMixture' | |
typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_builtin> builtin2builtin_c ; | |
typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_udt> builtin2udt_c ; | |
typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_builtin> udt2builtin_c ; | |
typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_udt> udt2udt_c ; | |
// Metafunction: | |
// | |
// for_udt_mixture<UdtMixture,BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt>::type | |
// | |
// {UdtMixture} is one of the Integral Constants for UdMixture, declared above. | |
// {BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt} are aribtrary types. (not metafunctions) | |
// | |
// According to the value of 'UdtMixture', selects the corresponding type. | |
// | |
template<class UdtMixture, class BuiltIn2BuiltIn, class BuiltIn2Udt, class Udt2BuiltIn, class Udt2Udt> | |
struct for_udt_builtin_mixture | |
{ | |
typedef typename | |
ct_switch4<UdtMixture | |
, builtin2builtin_c, builtin2udt_c, udt2builtin_c // default | |
, BuiltIn2BuiltIn , BuiltIn2Udt , Udt2BuiltIn , Udt2Udt | |
>::type | |
type ; | |
} ; | |
// Metafunction: | |
// | |
// get_udt_mixture<T,S>::type | |
// | |
// Selects the appropriate UdtMixture Integral Constant for the combination T,S. | |
// | |
template<class T,class S> | |
struct get_udt_builtin_mixture | |
{ | |
typedef is_arithmetic<S> S_builtin ; | |
typedef is_arithmetic<T> T_builtin ; | |
typedef typename | |
for_both<S_builtin, T_builtin, builtin2builtin_c, builtin2udt_c, udt2builtin_c, udt2udt_c>::type | |
type ; | |
} ; | |
} } } // namespace boost::numeric::convdetail | |
#endif | |