// (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_CONVERSION_TRAITS_FLC_12NOV2002_HPP | |
#define BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP | |
#include "boost/type_traits/is_arithmetic.hpp" | |
#include "boost/type_traits/is_same.hpp" | |
#include "boost/type_traits/remove_cv.hpp" | |
#include "boost/numeric/conversion/detail/meta.hpp" | |
#include "boost/numeric/conversion/detail/int_float_mixture.hpp" | |
#include "boost/numeric/conversion/detail/sign_mixture.hpp" | |
#include "boost/numeric/conversion/detail/udt_builtin_mixture.hpp" | |
#include "boost/numeric/conversion/detail/is_subranged.hpp" | |
namespace boost { namespace numeric { namespace convdetail | |
{ | |
//------------------------------------------------------------------- | |
// Implementation of the Conversion Traits for T != S | |
// | |
// This is a VISIBLE base class of the user-level conversion_traits<> class. | |
//------------------------------------------------------------------- | |
template<class T,class S> | |
struct non_trivial_traits_impl | |
{ | |
typedef typename get_int_float_mixture <T,S>::type int_float_mixture ; | |
typedef typename get_sign_mixture <T,S>::type sign_mixture ; | |
typedef typename get_udt_builtin_mixture <T,S>::type udt_builtin_mixture ; | |
typedef typename get_is_subranged<T,S>::type subranged ; | |
typedef mpl::false_ trivial ; | |
typedef T target_type ; | |
typedef S source_type ; | |
typedef T result_type ; | |
typedef typename mpl::if_< is_arithmetic<S>, S, S const&>::type argument_type ; | |
typedef typename mpl::if_<subranged,S,T>::type supertype ; | |
typedef typename mpl::if_<subranged,T,S>::type subtype ; | |
} ; | |
//------------------------------------------------------------------- | |
// Implementation of the Conversion Traits for T == S | |
// | |
// This is a VISIBLE base class of the user-level conversion_traits<> class. | |
//------------------------------------------------------------------- | |
template<class N> | |
struct trivial_traits_impl | |
{ | |
typedef typename get_int_float_mixture <N,N>::type int_float_mixture ; | |
typedef typename get_sign_mixture <N,N>::type sign_mixture ; | |
typedef typename get_udt_builtin_mixture<N,N>::type udt_builtin_mixture ; | |
typedef mpl::false_ subranged ; | |
typedef mpl::true_ trivial ; | |
typedef N target_type ; | |
typedef N source_type ; | |
typedef N const& result_type ; | |
typedef N const& argument_type ; | |
typedef N supertype ; | |
typedef N subtype ; | |
} ; | |
//------------------------------------------------------------------- | |
// Top level implementation selector. | |
//------------------------------------------------------------------- | |
template<class T, class S> | |
struct get_conversion_traits | |
{ | |
typedef typename remove_cv<T>::type target_type ; | |
typedef typename remove_cv<S>::type source_type ; | |
typedef typename is_same<target_type,source_type>::type is_trivial ; | |
typedef trivial_traits_impl <target_type> trivial_imp ; | |
typedef non_trivial_traits_impl<target_type,source_type> non_trivial_imp ; | |
typedef typename mpl::if_<is_trivial,trivial_imp,non_trivial_imp>::type type ; | |
} ; | |
} } } // namespace boost::numeric::convdetail | |
#endif | |