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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/multiprecision/traits/is_backend.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/multiprecision/traits/is_backend.hpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/multiprecision/traits/is_backend.hpp b/src/third_party/boost-1.69.0/boost/multiprecision/traits/is_backend.hpp new file mode 100644 index 00000000000..2a26b19df01 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/multiprecision/traits/is_backend.hpp @@ -0,0 +1,63 @@ +/////////////////////////////////////////////////////////////////////////////// +// Copyright 2015 John Maddock. Distributed under the Boost +// Software License, Version 1.0. (See accompanying file +// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) + +#ifndef BOOST_MP_IS_BACKEND_HPP +#define BOOST_MP_IS_BACKEND_HPP + +#include <boost/mpl/has_xxx.hpp> +#include <boost/type_traits/conditional.hpp> +#include <boost/type_traits/is_convertible.hpp> +#include <boost/multiprecision/detail/number_base.hpp> + +namespace boost{ namespace multiprecision{ namespace detail{ + + BOOST_MPL_HAS_XXX_TRAIT_DEF(signed_types) + BOOST_MPL_HAS_XXX_TRAIT_DEF(unsigned_types) + BOOST_MPL_HAS_XXX_TRAIT_DEF(float_types) + + template <class T> + struct is_backend + { + static const bool value = has_signed_types<T>::value && has_unsigned_types<T>::value && has_float_types<T>::value; + }; + + template <class Backend> + struct other_backend + { + typedef typename boost::conditional< + boost::is_same<number<Backend>, number<Backend, et_on> >::value, + number<Backend, et_off>, number<Backend, et_on> >::type type; + }; + + template <class B, class V> + struct number_from_backend + { + typedef typename boost::conditional < + boost::is_convertible<V, number<B> >::value, + number<B>, + typename other_backend<B>::type > ::type type; + }; + + template <bool b, class T, class U> + struct is_first_backend_imp{ static const bool value = false; }; + template <class T, class U> + struct is_first_backend_imp<true, T, U>{ static const bool value = is_convertible<U, number<T, et_on> >::value || is_convertible<U, number<T, et_off> >::value; }; + + template <class T, class U> + struct is_first_backend : is_first_backend_imp<is_backend<T>::value, T, U> {}; + + template <bool b, class T, class U> + struct is_second_backend_imp{ static const bool value = false; }; + template <class T, class U> + struct is_second_backend_imp<true, T, U>{ 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; }; + + template <class T, class U> + struct is_second_backend : is_second_backend_imp<is_backend<U>::value, T, U> {}; + +} +} +} + +#endif // BOOST_MP_IS_BACKEND_HPP |