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Diffstat (limited to 'boost/hana/detail/operators/orderable.hpp')
-rw-r--r-- | boost/hana/detail/operators/orderable.hpp | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/boost/hana/detail/operators/orderable.hpp b/boost/hana/detail/operators/orderable.hpp new file mode 100644 index 0000000000..f60f14bbde --- /dev/null +++ b/boost/hana/detail/operators/orderable.hpp @@ -0,0 +1,60 @@ +/*! +@file +Defines operators for Orderables. + +@copyright Louis Dionne 2013-2016 +Distributed under the Boost Software License, Version 1.0. +(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) + */ + +#ifndef BOOST_HANA_DETAIL_OPERATORS_ORDERABLE_HPP +#define BOOST_HANA_DETAIL_OPERATORS_ORDERABLE_HPP + +#include <boost/hana/config.hpp> +#include <boost/hana/core/tag_of.hpp> +#include <boost/hana/fwd/greater.hpp> +#include <boost/hana/fwd/greater_equal.hpp> +#include <boost/hana/fwd/less.hpp> +#include <boost/hana/fwd/less_equal.hpp> + +#include <type_traits> + + +BOOST_HANA_NAMESPACE_BEGIN namespace detail { + template <typename Tag> + struct orderable_operators { + static constexpr bool value = false; + }; + + namespace operators { + template <typename X, typename Y, typename = typename std::enable_if< + detail::orderable_operators<typename hana::tag_of<X>::type>::value || + detail::orderable_operators<typename hana::tag_of<Y>::type>::value + >::type> + constexpr auto operator<(X&& x, Y&& y) + { return hana::less(static_cast<X&&>(x), static_cast<Y&&>(y)); } + + template <typename X, typename Y, typename = typename std::enable_if< + detail::orderable_operators<typename hana::tag_of<X>::type>::value || + detail::orderable_operators<typename hana::tag_of<Y>::type>::value + >::type> + constexpr auto operator>(X&& x, Y&& y) + { return hana::greater(static_cast<X&&>(x), static_cast<Y&&>(y)); } + + template <typename X, typename Y, typename = typename std::enable_if< + detail::orderable_operators<typename hana::tag_of<X>::type>::value || + detail::orderable_operators<typename hana::tag_of<Y>::type>::value + >::type> + constexpr auto operator<=(X&& x, Y&& y) + { return hana::less_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); } + + template <typename X, typename Y, typename = typename std::enable_if< + detail::orderable_operators<typename hana::tag_of<X>::type>::value || + detail::orderable_operators<typename hana::tag_of<Y>::type>::value + >::type> + constexpr auto operator>=(X&& x, Y&& y) + { return hana::greater_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); } + } // end namespace operators +} BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_DETAIL_OPERATORS_ORDERABLE_HPP |