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 Hu Chunming
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/*!
@file
Defines `boost::hana::not_equal`.
Copyright Louis Dionne 2013-2022
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_NOT_EQUAL_HPP
#define BOOST_HANA_NOT_EQUAL_HPP
#include <boost/hana/fwd/not_equal.hpp>
#include <boost/hana/concept/comparable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/to.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/has_common_embedding.hpp>
#include <boost/hana/detail/nested_to.hpp> // required by fwd decl
#include <boost/hana/equal.hpp>
#include <boost/hana/not.hpp>
namespace boost { namespace hana {
//! @cond
template <typename X, typename Y>
constexpr auto not_equal_t::operator()(X&& x, Y&& y) const {
using T = typename hana::tag_of<X>::type;
using U = typename hana::tag_of<Y>::type;
using NotEqual = not_equal_impl<T, U>;
return NotEqual::apply(static_cast<X&&>(x), static_cast<Y&&>(y));
}
//! @endcond
template <typename T, typename U, bool condition>
struct not_equal_impl<T, U, when<condition>> : default_ {
template <typename X, typename Y>
static constexpr decltype(auto) apply(X&& x, Y&& y) {
return hana::not_(hana::equal(static_cast<X&&>(x),
static_cast<Y&&>(y)));
}
};
// Cross-type overload
template <typename T, typename U>
struct not_equal_impl<T, U, when<
detail::has_nontrivial_common_embedding<Comparable, T, U>::value
>> {
using C = typename hana::common<T, U>::type;
template <typename X, typename Y>
static constexpr decltype(auto) apply(X&& x, Y&& y) {
return hana::not_equal(hana::to<C>(static_cast<X&&>(x)),
hana::to<C>(static_cast<Y&&>(y)));
}
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_NOT_EQUAL_HPP
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