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28 lines
749 B
C++
28 lines
749 B
C++
#ifndef SPROUT_FUNCTIONAL_POLYMORPHIC_MINUS_HPP
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#define SPROUT_FUNCTIONAL_POLYMORPHIC_MINUS_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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// minus_t
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// minus_
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//
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struct minus_t {
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public:
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template<typename T, typename U>
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SPROUT_CONSTEXPR decltype(std::declval<T>() - std::declval<U>())
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operator()(T&& x, U&& y)
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const SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(std::declval<T>() - std::declval<U>()))
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{
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return sprout::forward<T>(x) - sprout::forward<U>(y);
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}
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};
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::minus_t minus_{};
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} // anonymous-namespace
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_POLYMORPHIC_MINUS_HPP
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