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https://github.com/bolero-MURAKAMI/Sprout.git
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29 lines
677 B
C++
29 lines
677 B
C++
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#ifndef SPROUT_FUNCTIONAL_POLYMORPHIC_NEGATE_HPP
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#define SPROUT_FUNCTIONAL_POLYMORPHIC_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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namespace sprout {
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//
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// negate_t
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// negate_
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//
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struct negate_t {
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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_EXPR(SPROUT_NOEXCEPT_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 {
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SPROUT_STATIC_CONSTEXPR sprout::negate_t negate_{};
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} // anonymous-namespace
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_POLYMORPHIC_NEGATE_HPP
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