1 // © Copyright Fernando Luis Cacciola Carballal 2000-2004
2 // Use, modification, and distribution is subject to the Boost Software
3 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
6 // See library home page at http://www.boost.org/libs/numeric/conversion
8 // Contact the author at: fernando_cacciola@hotmail.com
10 #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP
11 #define BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP
13 #include "boost/type_traits/is_arithmetic.hpp"
15 #include "boost/numeric/conversion/udt_builtin_mixture_enum.hpp"
16 #include "boost/numeric/conversion/detail/meta.hpp"
18 #include "boost/mpl/integral_c.hpp"
20 namespace boost { namespace numeric { namespace convdetail
22 // Integral Constants for 'UdtMixture'
23 typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_builtin> builtin2builtin_c ;
24 typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_udt> builtin2udt_c ;
25 typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_builtin> udt2builtin_c ;
26 typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_udt> udt2udt_c ;
30 // for_udt_mixture<UdtMixture,BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt>::type
32 // {UdtMixture} is one of the Integral Constants for UdMixture, declared above.
33 // {BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt} are aribtrary types. (not metafunctions)
35 // According to the value of 'UdtMixture', selects the corresponding type.
37 template<class UdtMixture, class BuiltIn2BuiltIn, class BuiltIn2Udt, class Udt2BuiltIn, class Udt2Udt>
38 struct for_udt_builtin_mixture
42 , builtin2builtin_c, builtin2udt_c, udt2builtin_c // default
43 , BuiltIn2BuiltIn , BuiltIn2Udt , Udt2BuiltIn , Udt2Udt
50 // get_udt_mixture<T,S>::type
52 // Selects the appropriate UdtMixture Integral Constant for the combination T,S.
54 template<class T,class S>
55 struct get_udt_builtin_mixture
57 typedef is_arithmetic<S> S_builtin ;
58 typedef is_arithmetic<T> T_builtin ;
61 for_both<S_builtin, T_builtin, builtin2builtin_c, builtin2udt_c, udt2builtin_c, udt2udt_c>::type
65 } } } // namespace boost::numeric::convdetail