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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/numeric/conversion/detail/meta.hpp
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+// (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
+
+