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48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011 RiSK (sscrisk)
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https://github.com/sscrisk/CEL---ConstExpr-Library
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_FUNCTIONAL_NEGATE_HPP
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#define SPROUT_FUNCTIONAL_NEGATE_HPP
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/functional/transparent.hpp>
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namespace sprout {
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// 20.8.4 Arithmetic operations
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template<typename T = void>
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struct negate {
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public:
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typedef T argument_type;
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typedef T result_type;
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public:
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SPROUT_CONSTEXPR T operator()(T const& x) const {
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return -x;
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}
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};
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template<>
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struct negate<void>
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: public sprout::transparent<>
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{
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public:
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template<typename T>
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SPROUT_CONSTEXPR decltype(-std::declval<T>())
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operator()(T&& x)
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const SPROUT_NOEXCEPT_IF_EXPR(-std::declval<T>())
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{
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return -SPROUT_FORWARD(T, x);
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}
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};
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_NEGATE_HPP
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