mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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95 lines
3 KiB
C++
95 lines
3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_EQUIV_HPP
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#define SPROUT_FUNCTIONAL_EQUIV_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/functional/less.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 Compare, bool IsStrict = sprout::is_strict_binary_function<Compare>::value>
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class equiv_adaptor_impl;
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template<typename Compare>
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class equiv_adaptor_impl<Compare, true> {
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public:
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typedef typename Compare::first_argument_type first_argument_type;
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typedef typename Compare::second_argument_type second_argument_type;
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typedef bool result_type;
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protected:
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Compare fn;
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public:
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explicit SPROUT_CONSTEXPR equiv_adaptor_impl(Compare const& comp)
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: fn(comp)
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{}
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SPROUT_CONSTEXPR bool operator()(typename Compare::first_argument_type const& x, typename Compare::second_argument_type const& y) const {
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return !fn(x, y) && !fn(y, x);
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}
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};
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template<typename Compare>
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class equiv_adaptor_impl<Compare, false> {
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protected:
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Compare fn;
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public:
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explicit SPROUT_CONSTEXPR equiv_adaptor_impl(Compare const& comp)
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: fn(comp)
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{}
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template<typename T, typename U>
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SPROUT_CONSTEXPR decltype(!std::declval<Compare const&>()(std::declval<T>(), std::declval<U>()) && !std::declval<Compare const&>()(std::declval<U>(), std::declval<T>()))
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operator()(T&& x, U&& y) const {
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return !fn(SPROUT_FORWARD(T, x), SPROUT_FORWARD(U, y)) && !fn(SPROUT_FORWARD(U, y), SPROUT_FORWARD(T, x));
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}
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};
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} // namespace detail
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//
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// equiv_adaptor
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//
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template<typename Compare = void>
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class equiv_adaptor
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: public sprout::detail::equiv_adaptor_impl<Compare>
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{
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public:
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explicit SPROUT_CONSTEXPR equiv_adaptor(Compare const& comp)
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: sprout::detail::equiv_adaptor_impl<Compare>(comp)
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{}
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};
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template<>
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class equiv_adaptor<void>
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: public sprout::detail::equiv_adaptor_impl<sprout::less<> >
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{
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public:
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SPROUT_CONSTEXPR equiv_adaptor()
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: sprout::detail::equiv_adaptor_impl<sprout::less<> >(sprout::less<>())
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{}
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explicit SPROUT_CONSTEXPR equiv_adaptor(sprout::less<> const& comp)
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: sprout::detail::equiv_adaptor_impl<sprout::less<> >(comp)
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{}
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};
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//
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// equiv
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//
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template<typename Compare>
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inline SPROUT_CONSTEXPR sprout::equiv_adaptor<Compare>
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equiv(Compare const& comp) {
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return sprout::equiv_adaptor<Compare>(comp);
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}
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inline SPROUT_CONSTEXPR sprout::equiv_adaptor<>
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equiv() {
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return sprout::equiv_adaptor<>();
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_EQUIV_HPP
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