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https://github.com/bolero-MURAKAMI/Sprout.git
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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*=============================================================================
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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_NOT1_HPP
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#define SPROUT_FUNCTIONAL_NOT1_HPP
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#include <functional>
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/functional/type_traits/is_strict_function.hpp>
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#include <sprout/utility/forward.hpp>
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namespace sprout {
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namespace detail {
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template<typename Predicate, bool IsStrict = sprout::is_strict_unary_function<Predicate>::value>
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class unary_negate_impl;
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template<typename Predicate>
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class unary_negate_impl<Predicate, true> {
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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_impl(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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class unary_negate_impl<Predicate, false> {
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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_impl(Predicate const& pred)
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: fn(pred)
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{}
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template<typename T>
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SPROUT_CONSTEXPR decltype(!std::declval<Predicate const&>()(std::declval<T>()))
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operator()(T&& x) const {
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return !fn(SPROUT_FORWARD(T, x));
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}
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};
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} // namespace detail
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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 sprout::detail::unary_negate_impl<Predicate>
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{
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public:
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explicit SPROUT_CONSTEXPR unary_negate(Predicate const& pred)
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: sprout::detail::unary_negate_impl<Predicate>(pred)
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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>
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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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