1 | // (c) Copyright Fernando Luis Cacciola Carballal 2000-2004 |
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2 | // Use, modification, and distribution is subject to the Boost Software |
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3 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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4 | // http://www.boost.org/LICENSE_1_0.txt) |
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5 | |
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6 | // See library home page at http://www.boost.org/libs/numeric/conversion |
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7 | // |
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8 | // Contact the author at: fernando_cacciola@hotmail.com |
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9 | // |
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10 | #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP |
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11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_UDT_BUILTIN_MIXTURE_FLC_12NOV2002_HPP |
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12 | |
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13 | #include "boost/type_traits/is_arithmetic.hpp" |
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14 | |
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15 | #include "boost/numeric/conversion/udt_builtin_mixture_enum.hpp" |
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16 | #include "boost/numeric/conversion/detail/meta.hpp" |
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17 | |
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18 | #include "boost/mpl/integral_c.hpp" |
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19 | |
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20 | namespace boost { namespace numeric { namespace convdetail |
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21 | { |
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22 | // Integral Constants for 'UdtMixture' |
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23 | typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_builtin> builtin2builtin_c ; |
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24 | typedef mpl::integral_c<udt_builtin_mixture_enum, builtin_to_udt> builtin2udt_c ; |
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25 | typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_builtin> udt2builtin_c ; |
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26 | typedef mpl::integral_c<udt_builtin_mixture_enum, udt_to_udt> udt2udt_c ; |
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27 | |
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28 | // Metafunction: |
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29 | // |
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30 | // for_udt_mixture<UdtMixture,BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt>::type |
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31 | // |
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32 | // {UdtMixture} is one of the Integral Constants for UdMixture, declared above. |
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33 | // {BuiltIn2BuiltIn,BuiltIn2Udt,Udt2BuiltIn,Udt2Udt} are aribtrary types. (not metafunctions) |
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34 | // |
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35 | // According to the value of 'UdtMixture', selects the corresponding type. |
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36 | // |
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37 | template<class UdtMixture, class BuiltIn2BuiltIn, class BuiltIn2Udt, class Udt2BuiltIn, class Udt2Udt> |
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38 | struct for_udt_builtin_mixture |
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39 | { |
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40 | typedef typename |
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41 | ct_switch4<UdtMixture |
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42 | , builtin2builtin_c, builtin2udt_c, udt2builtin_c // default |
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43 | , BuiltIn2BuiltIn , BuiltIn2Udt , Udt2BuiltIn , Udt2Udt |
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44 | >::type |
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45 | type ; |
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46 | } ; |
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47 | |
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48 | // Metafunction: |
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49 | // |
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50 | // get_udt_mixture<T,S>::type |
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51 | // |
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52 | // Selects the appropriate UdtMixture Integral Constant for the combination T,S. |
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53 | // |
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54 | template<class T,class S> |
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55 | struct get_udt_builtin_mixture |
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56 | { |
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57 | typedef is_arithmetic<S> S_builtin ; |
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58 | typedef is_arithmetic<T> T_builtin ; |
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59 | |
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60 | typedef typename |
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61 | for_both<S_builtin, T_builtin, builtin2builtin_c, builtin2udt_c, udt2builtin_c, udt2udt_c>::type |
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62 | type ; |
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63 | } ; |
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64 | |
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65 | } } } // namespace boost::numeric::convdetail |
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66 | |
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67 | #endif |
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68 | |
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69 | |
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