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Sprout/sprout/functional/not_equal_to.hpp

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/*=============================================================================
Copyright (c) 2011 RiSK (sscrisk)
https://github.com/sscrisk/CEL---ConstExpr-Library
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
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#ifndef SPROUT_FUNCTIONAL_NOT_EQUAL_TO_HPP
#define SPROUT_FUNCTIONAL_NOT_EQUAL_TO_HPP
#include <utility>
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#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
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namespace sprout {
// 20.8.5 Comparisons
template<typename T = void>
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struct not_equal_to {
public:
typedef T first_argument_type;
typedef T second_argument_type;
typedef bool result_type;
public:
SPROUT_CONSTEXPR bool operator()(T const& x, T const& y) const {
return x != y;
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}
};
template<>
struct not_equal_to<void> {
public:
typedef void is_transparent;
public:
template<typename T, typename U>
SPROUT_CONSTEXPR decltype(std::declval<T>() != std::declval<U>())
operator()(T&& x, U&& y)
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const SPROUT_NOEXCEPT_IF_EXPR(std::declval<T>() != std::declval<U>())
{
return SPROUT_FORWARD(T, x) != SPROUT_FORWARD(U, y);
}
};
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} // namespace sprout
#endif // #ifndef SPROUT_FUNCTIONAL_NOT_EQUAL_TO_HPP