73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
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// (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See library home page at http://www.boost.org/libs/numeric/conversion
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//
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// Contact the author at: fernando_cacciola@hotmail.com
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//
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#ifndef BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP
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#define BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP
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#include "boost/config.hpp"
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#include "boost/limits.hpp"
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#include "boost/numeric/conversion/int_float_mixture_enum.hpp"
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#include "boost/numeric/conversion/detail/meta.hpp"
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#include "boost/mpl/integral_c.hpp"
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namespace boost { namespace numeric { namespace convdetail
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{
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// Integral Constants for 'IntFloatMixture'
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typedef mpl::integral_c<int_float_mixture_enum, integral_to_integral> int2int_c ;
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typedef mpl::integral_c<int_float_mixture_enum, integral_to_float> int2float_c ;
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typedef mpl::integral_c<int_float_mixture_enum, float_to_integral> float2int_c ;
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typedef mpl::integral_c<int_float_mixture_enum, float_to_float> float2float_c ;
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// Metafunction:
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//
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// get_int_float_mixture<T,S>::type
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//
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// Selects the appropriate Int-Float Mixture Integral Constant for the combination T,S.
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//
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template<class T,class S>
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struct get_int_float_mixture
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{
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typedef mpl::bool_< ::std::numeric_limits<S>::is_integer > S_int ;
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typedef mpl::bool_< ::std::numeric_limits<T>::is_integer > T_int ;
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typedef typename
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for_both<S_int, T_int, int2int_c, int2float_c, float2int_c, float2float_c>::type
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type ;
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} ;
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// Metafunction:
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//
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// for_int_float_mixture<Mixture,int_int,int_float,float_int,float_float>::type
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//
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// {Mixture} is one of the Integral Constants for Mixture, declared above.
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// {int_int,int_float,float_int,float_float} are aribtrary types. (not metafunctions)
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//
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// According to the value of 'IntFloatMixture', selects the corresponding type.
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//
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template<class IntFloatMixture, class Int2Int, class Int2Float, class Float2Int, class Float2Float>
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struct for_int_float_mixture
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{
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typedef typename
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ct_switch4<IntFloatMixture
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,int2int_c, int2float_c, float2int_c // default
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,Int2Int , Int2Float , Float2Int , Float2Float
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>::type
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type ;
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} ;
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} } } // namespace boost::numeric::convdetail
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#endif
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//
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///////////////////////////////////////////////////////////////////////////////////////////////
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