mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-23 08:45:28 +00:00
121 lines
3.6 KiB
C++
121 lines
3.6 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_META_FLC_12NOV2002_HPP
|
|
#define BOOST_NUMERIC_CONVERSION_DETAIL_META_FLC_12NOV2002_HPP
|
|
|
|
#include "boost/type_traits/remove_cv.hpp"
|
|
|
|
#include "boost/mpl/if.hpp"
|
|
#include "boost/mpl/eval_if.hpp"
|
|
#include "boost/mpl/equal_to.hpp"
|
|
#include "boost/mpl/not.hpp"
|
|
#include "boost/mpl/and.hpp"
|
|
#include "boost/mpl/bool.hpp"
|
|
#include "boost/mpl/identity.hpp"
|
|
|
|
namespace boost { namespace numeric { namespace convdetail
|
|
{
|
|
template< class T1, class T2>
|
|
struct equal_to
|
|
{
|
|
#if !defined(__BORLANDC__)
|
|
|
|
enum { x = ( BOOST_MPL_AUX_VALUE_WKND(T1)::value == BOOST_MPL_AUX_VALUE_WKND(T2)::value ) };
|
|
|
|
BOOST_STATIC_CONSTANT(bool, value = x);
|
|
|
|
typedef mpl::bool_<value> type;
|
|
|
|
#else
|
|
|
|
BOOST_STATIC_CONSTANT(bool, value = (
|
|
BOOST_MPL_AUX_VALUE_WKND(T1)::value
|
|
== BOOST_MPL_AUX_VALUE_WKND(T2)::value
|
|
));
|
|
|
|
typedef mpl::bool_<(
|
|
BOOST_MPL_AUX_VALUE_WKND(T1)::value
|
|
== BOOST_MPL_AUX_VALUE_WKND(T2)::value
|
|
)> type;
|
|
#endif
|
|
};
|
|
|
|
// Metafunction:
|
|
//
|
|
// ct_switch4<Value,Case0Val,Case1Val,Case2Val,Case0Type,Case1Type,Case2Type,DefaultType>::type
|
|
//
|
|
// {Value,Case(X)Val} are Integral Constants (such as: mpl::int_<>)
|
|
// {Case(X)Type,DefaultType} are arbitrary types. (not metafunctions)
|
|
//
|
|
// Returns Case(X)Type if Val==Case(X)Val; DefaultType otherwise.
|
|
//
|
|
template<class Value,
|
|
class Case0Val,
|
|
class Case1Val,
|
|
class Case2Val,
|
|
class Case0Type,
|
|
class Case1Type,
|
|
class Case2Type,
|
|
class DefaultType
|
|
>
|
|
struct ct_switch4
|
|
{
|
|
typedef mpl::identity<Case0Type> Case0TypeQ ;
|
|
typedef mpl::identity<Case1Type> Case1TypeQ ;
|
|
|
|
typedef equal_to<Value,Case0Val> is_case0 ;
|
|
typedef equal_to<Value,Case1Val> is_case1 ;
|
|
typedef equal_to<Value,Case2Val> is_case2 ;
|
|
|
|
typedef mpl::if_<is_case2,Case2Type,DefaultType> choose_2_3Q ;
|
|
typedef mpl::eval_if<is_case1,Case1TypeQ,choose_2_3Q> choose_1_2_3Q ;
|
|
|
|
typedef typename
|
|
mpl::eval_if<is_case0,Case0TypeQ,choose_1_2_3Q>::type
|
|
type ;
|
|
} ;
|
|
|
|
|
|
|
|
|
|
// Metafunction:
|
|
//
|
|
// for_both<expr0,expr1,TT,TF,FT,FF>::type
|
|
//
|
|
// {exp0,expr1} are Boolean Integral Constants
|
|
// {TT,TF,FT,FF} are aribtrary types. (not metafunctions)
|
|
//
|
|
// According to the combined boolean value of 'expr0 && expr1', selects the corresponding type.
|
|
//
|
|
template<class expr0, class expr1, class TT, class TF, class FT, class FF>
|
|
struct for_both
|
|
{
|
|
typedef mpl::identity<TF> TF_Q ;
|
|
typedef mpl::identity<TT> TT_Q ;
|
|
|
|
typedef typename mpl::not_<expr0>::type not_expr0 ;
|
|
typedef typename mpl::not_<expr1>::type not_expr1 ;
|
|
|
|
typedef typename mpl::and_<expr0,expr1>::type caseTT ;
|
|
typedef typename mpl::and_<expr0,not_expr1>::type caseTF ;
|
|
typedef typename mpl::and_<not_expr0,expr1>::type caseFT ;
|
|
|
|
typedef mpl::if_<caseFT,FT,FF> choose_FT_FF_Q ;
|
|
typedef mpl::eval_if<caseTF,TF_Q,choose_FT_FF_Q> choose_TF_FT_FF_Q ;
|
|
|
|
typedef typename mpl::eval_if<caseTT,TT_Q,choose_TF_FT_FF_Q>::type type ;
|
|
} ;
|
|
|
|
} } } // namespace boost::numeric::convdetail
|
|
|
|
#endif
|
|
|
|
|