projects / ceph.git / blame
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1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Copyright 2015 John Maddock. Distributed under the Boost | |
| 3 | // Software License, Version 1.0. (See accompanying file | |
| 4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 5 | ||
| 6 | #ifndef BOOST_MP_IS_BACKEND_HPP | |
| 7 | #define BOOST_MP_IS_BACKEND_HPP | |
| 8 | ||
| 9 | #include <boost/mpl/has_xxx.hpp> | |
| 10 | #include <boost/type_traits/conditional.hpp> | |
| 11 | #include <boost/type_traits/is_convertible.hpp> | |
| 12 | #include <boost/multiprecision/detail/number_base.hpp> | |
| 13 | ||
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14 | namespace boost { namespace multiprecision { namespace detail { |
| 15 | ||
| 16 | BOOST_MPL_HAS_XXX_TRAIT_DEF(signed_types) | |
| 17 | BOOST_MPL_HAS_XXX_TRAIT_DEF(unsigned_types) | |
| 18 | BOOST_MPL_HAS_XXX_TRAIT_DEF(float_types) | |
| 19 | ||
| 20 | template <class T> | |
| 21 | struct is_backend | |
| 22 | { | |
| 23 | static const bool value = has_signed_types<T>::value && has_unsigned_types<T>::value && has_float_types<T>::value; | |
| 24 | }; | |
| 25 | ||
| 26 | template <class Backend> | |
| 27 | struct other_backend | |
| 28 | { | |
| 29 | typedef typename boost::conditional< | |
| 30 | boost::is_same<number<Backend>, number<Backend, et_on> >::value, | |
| 31 | number<Backend, et_off>, number<Backend, et_on> >::type type; | |
| 32 | }; | |
| 33 | ||
| 34 | template <class B, class V> | |
| 35 | struct number_from_backend | |
| 36 | { | |
| 37 | typedef typename boost::conditional< | |
| 38 | boost::is_convertible<V, number<B> >::value, | |
| 39 | number<B>, | |
| 40 | typename other_backend<B>::type>::type type; | |
| 41 | }; | |
| 42 | ||
| 43 | template <bool b, class T, class U> | |
| 44 | struct is_first_backend_imp | |
| 45 | { | |
| 46 | static const bool value = false; | |
| 47 | }; | |
| 48 | template <class T, class U> | |
| 49 | struct is_first_backend_imp<true, T, U> | |
| 50 | { | |
| 51 | static const bool value = is_convertible<U, number<T, et_on> >::value || is_convertible<U, number<T, et_off> >::value; | |
| 52 | }; | |
| 53 | ||
| 54 | template <class T, class U> | |
| 55 | struct is_first_backend : is_first_backend_imp<is_backend<T>::value, T, U> | |
| 56 | {}; | |
| 57 | ||
| 58 | template <bool b, class T, class U> | |
| 59 | struct is_second_backend_imp | |
| 60 | { | |
| 61 | static const bool value = false; | |
| 62 | }; | |
| 63 | template <class T, class U> | |
| 64 | struct is_second_backend_imp<true, T, U> | |
| 65 | { | |
| 66 | static const bool value = (is_convertible<T, number<U, et_on> >::value || is_convertible<T, number<U, et_off> >::value) && !is_first_backend<T, U>::value; | |
| 67 | }; | |
| 68 | ||
| 69 | template <class T, class U> | |
| 70 | struct is_second_backend : is_second_backend_imp<is_backend<U>::value, T, U> | |
| 71 | {}; | |
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72 | |
| 73 | } | |
| 74 | } | |
| 92f5a8d4 | 75 | } // namespace boost::multiprecision::detail |
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76 | |
| 77 | #endif // BOOST_MP_IS_BACKEND_HPP |