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_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP |
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11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP |
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12 | |
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13 | #include "boost/config.hpp" |
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14 | #include "boost/limits.hpp" |
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15 | |
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16 | #include "boost/numeric/conversion/int_float_mixture_enum.hpp" |
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17 | #include "boost/numeric/conversion/detail/meta.hpp" |
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18 | |
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19 | #include "boost/mpl/integral_c.hpp" |
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20 | |
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21 | namespace boost { namespace numeric { namespace convdetail |
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22 | { |
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23 | // Integral Constants for 'IntFloatMixture' |
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24 | typedef mpl::integral_c<int_float_mixture_enum, integral_to_integral> int2int_c ; |
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25 | typedef mpl::integral_c<int_float_mixture_enum, integral_to_float> int2float_c ; |
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26 | typedef mpl::integral_c<int_float_mixture_enum, float_to_integral> float2int_c ; |
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27 | typedef mpl::integral_c<int_float_mixture_enum, float_to_float> float2float_c ; |
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28 | |
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29 | // Metafunction: |
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30 | // |
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31 | // get_int_float_mixture<T,S>::type |
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32 | // |
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33 | // Selects the appropriate Int-Float Mixture Integral Constant for the combination T,S. |
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34 | // |
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35 | template<class T,class S> |
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36 | struct get_int_float_mixture |
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37 | { |
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38 | typedef mpl::bool_< ::std::numeric_limits<S>::is_integer > S_int ; |
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39 | typedef mpl::bool_< ::std::numeric_limits<T>::is_integer > T_int ; |
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40 | |
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41 | typedef typename |
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42 | for_both<S_int, T_int, int2int_c, int2float_c, float2int_c, float2float_c>::type |
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43 | type ; |
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44 | } ; |
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45 | |
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46 | // Metafunction: |
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47 | // |
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48 | // for_int_float_mixture<Mixture,int_int,int_float,float_int,float_float>::type |
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49 | // |
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50 | // {Mixture} is one of the Integral Constants for Mixture, declared above. |
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51 | // {int_int,int_float,float_int,float_float} are aribtrary types. (not metafunctions) |
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52 | // |
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53 | // According to the value of 'IntFloatMixture', selects the corresponding type. |
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54 | // |
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55 | template<class IntFloatMixture, class Int2Int, class Int2Float, class Float2Int, class Float2Float> |
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56 | struct for_int_float_mixture |
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57 | { |
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58 | typedef typename |
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59 | ct_switch4<IntFloatMixture |
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60 | ,int2int_c, int2float_c, float2int_c // default |
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61 | ,Int2Int , Int2Float , Float2Int , Float2Float |
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62 | >::type |
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63 | type ; |
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64 | } ; |
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65 | |
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66 | } } } // namespace boost::numeric::convdetail |
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67 | |
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68 | #endif |
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69 | // |
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70 | /////////////////////////////////////////////////////////////////////////////////////////////// |
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71 | |
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72 | |
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