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authorDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:38:45 +0900
committerDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:39:52 +0900
commit5cde13f21d36c7224b0e13d11c4b49379ae5210d (patch)
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Imported Upstream version 1.61.0
Change-Id: I96a1f878d1e6164f01e9aadd5147f38fca448d90 Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
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+/*!
+@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