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https://github.com/bolero-MURAKAMI/Sprout.git
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32 lines
811 B
C++
32 lines
811 B
C++
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#ifndef SPROUT_FUNCTIONAL_NOT1_HPP
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#define SPROUT_FUNCTIONAL_NOT1_HPP
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#include <functional>
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#include <sprout/config.hpp>
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namespace sprout {
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// 20.8.8 negators
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template<typename Predicate>
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class unary_negate {
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public:
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typedef typename Predicate::argument_type argument_type;
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typedef bool result_type;
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protected:
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Predicate fn;
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public:
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explicit SPROUT_CONSTEXPR unary_negate(Predicate const& pred)
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: fn(pred)
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{}
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SPROUT_CONSTEXPR bool operator()(typename Predicate::argument_type const& x) const {
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return !fn(x);
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}
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};
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template<typename Predicate>
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inline SPROUT_CONSTEXPR sprout::unary_negate<Predicate> not1(Predicate const& pred) {
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return sprout::unary_negate<Predicate>(pred);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_NOT1_HPP
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