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/*!
@file
Defines operators for Comparables.
@copyright Louis Dionne 2013-2017
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_COMPARABLE_HPP
#define BOOST_HANA_DETAIL_OPERATORS_COMPARABLE_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/fwd/equal.hpp>
#include <boost/hana/fwd/not_equal.hpp>
#include <type_traits>
BOOST_HANA_NAMESPACE_BEGIN namespace detail {
template <typename Tag>
struct comparable_operators {
static constexpr bool value = false;
};
namespace operators {
template <typename X, typename Y, typename = typename std::enable_if<
detail::comparable_operators<typename hana::tag_of<X>::type>::value ||
detail::comparable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator==(X&& x, Y&& y)
{ return hana::equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::comparable_operators<typename hana::tag_of<X>::type>::value ||
detail::comparable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator!=(X&& x, Y&& y)
{ return hana::not_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
} // end namespace operators
} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_OPERATORS_COMPARABLE_HPP
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