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