53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
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/*!
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@file
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Defines operators for Comparables.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_DETAIL_OPERATORS_COMPARABLE_HPP
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#define BOOST_HANA_DETAIL_OPERATORS_COMPARABLE_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/tag_of.hpp>
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#include <boost/hana/fwd/equal.hpp>
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#include <boost/hana/fwd/not_equal.hpp>
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#include <type_traits>
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namespace boost { namespace hana { namespace detail {
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template <typename Tag>
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struct comparable_operators {
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static constexpr bool value = false;
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};
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namespace operators {
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template <typename X, typename Y, typename = typename std::enable_if<
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!detail::has_idempotent_tag<X>::value &&
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!detail::has_idempotent_tag<Y>::value &&
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(detail::comparable_operators<
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typename hana::tag_of<X>::type>::value ||
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detail::comparable_operators<
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typename hana::tag_of<Y>::type>::value)
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>::type>
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constexpr auto operator==(X&& x, Y&& y)
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{ return hana::equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
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template <typename X, typename Y, typename = typename std::enable_if<
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!detail::has_idempotent_tag<X>::value &&
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!detail::has_idempotent_tag<Y>::value &&
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(detail::comparable_operators<
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typename hana::tag_of<X>::type>::value ||
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detail::comparable_operators<
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typename hana::tag_of<Y>::type>::value)
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>::type>
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constexpr auto operator!=(X&& x, Y&& y)
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{ return hana::not_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
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} // end namespace operators
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} }} // end namespace boost::hana
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#endif // !BOOST_HANA_DETAIL_OPERATORS_COMPARABLE_HPP
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