1 | // Copyright 2005 Alexander Nasonov. |
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2 | // Distributed under the Boost Software License, Version 1.0. (See |
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3 | // 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 | #ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED |
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7 | #define FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED |
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8 | |
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9 | #include <boost/config.hpp> |
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10 | |
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11 | #ifdef BOOST_NO_CV_SPECIALIZATIONS |
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12 | #include <boost/mpl/at.hpp> |
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13 | #include <boost/mpl/int.hpp> |
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14 | #include <boost/mpl/multiplies.hpp> |
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15 | #include <boost/mpl/plus.hpp> |
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16 | #include <boost/mpl/vector.hpp> |
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17 | #include <boost/type_traits/is_same.hpp> |
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18 | #endif |
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19 | |
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20 | // Should be the last #include |
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21 | #include <boost/type_traits/detail/type_trait_def.hpp> |
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22 | |
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23 | namespace boost { |
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24 | |
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25 | namespace type_traits { namespace detail { |
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26 | |
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27 | #ifndef BOOST_NO_CV_SPECIALIZATIONS |
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28 | |
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29 | template<class T> |
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30 | struct floating_point_promotion |
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31 | { |
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32 | typedef T type; |
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33 | }; |
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34 | |
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35 | template<> |
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36 | struct floating_point_promotion<float> |
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37 | { |
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38 | typedef double type; |
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39 | }; |
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40 | |
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41 | template<> |
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42 | struct floating_point_promotion<float const> |
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43 | { |
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44 | typedef double const type; |
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45 | }; |
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46 | |
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47 | template<> |
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48 | struct floating_point_promotion<float volatile> |
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49 | { |
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50 | typedef double volatile type; |
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51 | }; |
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52 | |
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53 | template<> |
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54 | struct floating_point_promotion<float const volatile> |
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55 | { |
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56 | typedef double const volatile type; |
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57 | }; |
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58 | |
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59 | #else |
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60 | |
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61 | template<class T> |
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62 | struct floating_point_promotion |
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63 | : mpl::at< |
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64 | mpl::vector< T, double, double const, double volatile, |
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65 | double const volatile > |
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66 | , mpl::plus< |
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67 | is_same<T, float> |
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68 | , mpl::multiplies< is_same<T, float const> , mpl::int_<2> > |
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69 | , mpl::multiplies< is_same<T, float volatile> , mpl::int_<3> > |
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70 | , mpl::multiplies< is_same<T, float const volatile>, mpl::int_<4> > |
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71 | > |
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72 | > |
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73 | { |
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74 | }; |
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75 | |
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76 | #endif |
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77 | |
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78 | } } |
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79 | |
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80 | BOOST_TT_AUX_TYPE_TRAIT_DEF1( |
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81 | floating_point_promotion |
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82 | , T |
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83 | , BOOST_DEDUCED_TYPENAME |
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84 | boost::type_traits::detail::floating_point_promotion<T>::type |
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85 | ) |
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86 | } |
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87 | |
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88 | #include <boost/type_traits/detail/type_trait_undef.hpp> |
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89 | |
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90 | #endif // #ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED |
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91 | |
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