mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
95 lines
3 KiB
C++
95 lines
3 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2016 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_FUNCTIONAL_EQUIV_HPP
|
|
#define SPROUT_FUNCTIONAL_EQUIV_HPP
|
|
|
|
#include <functional>
|
|
#include <utility>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/functional/type_traits/is_strict_function.hpp>
|
|
#include <sprout/functional/less.hpp>
|
|
#include <sprout/utility/forward.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename Compare, bool IsStrict = sprout::is_strict_binary_function<Compare>::value>
|
|
class equiv_adaptor_impl;
|
|
|
|
template<typename Compare>
|
|
class equiv_adaptor_impl<Compare, true> {
|
|
public:
|
|
typedef typename Compare::first_argument_type first_argument_type;
|
|
typedef typename Compare::second_argument_type second_argument_type;
|
|
typedef bool result_type;
|
|
protected:
|
|
Compare fn;
|
|
public:
|
|
explicit SPROUT_CONSTEXPR equiv_adaptor_impl(Compare const& comp)
|
|
: fn(comp)
|
|
{}
|
|
SPROUT_CONSTEXPR bool operator()(typename Compare::first_argument_type const& x, typename Compare::second_argument_type const& y) const {
|
|
return !fn(x, y) && !fn(y, x);
|
|
}
|
|
};
|
|
|
|
template<typename Compare>
|
|
class equiv_adaptor_impl<Compare, false> {
|
|
protected:
|
|
Compare fn;
|
|
public:
|
|
explicit SPROUT_CONSTEXPR equiv_adaptor_impl(Compare const& comp)
|
|
: fn(comp)
|
|
{}
|
|
template<typename T, typename U>
|
|
SPROUT_CONSTEXPR decltype(!std::declval<Compare const&>()(std::declval<T>(), std::declval<U>()) && !std::declval<Compare const&>()(std::declval<U>(), std::declval<T>()))
|
|
operator()(T&& x, U&& y) const {
|
|
return !fn(SPROUT_FORWARD(T, x), SPROUT_FORWARD(U, y)) && !fn(SPROUT_FORWARD(U, y), SPROUT_FORWARD(T, x));
|
|
}
|
|
};
|
|
} // namespace detail
|
|
|
|
//
|
|
// equiv_adaptor
|
|
//
|
|
template<typename Compare = void>
|
|
class equiv_adaptor
|
|
: public sprout::detail::equiv_adaptor_impl<Compare>
|
|
{
|
|
public:
|
|
explicit SPROUT_CONSTEXPR equiv_adaptor(Compare const& comp)
|
|
: sprout::detail::equiv_adaptor_impl<Compare>(comp)
|
|
{}
|
|
};
|
|
template<>
|
|
class equiv_adaptor<void>
|
|
: public sprout::detail::equiv_adaptor_impl<sprout::less<> >
|
|
{
|
|
public:
|
|
SPROUT_CONSTEXPR equiv_adaptor()
|
|
: sprout::detail::equiv_adaptor_impl<sprout::less<> >(sprout::less<>())
|
|
{}
|
|
explicit SPROUT_CONSTEXPR equiv_adaptor(sprout::less<> const& comp)
|
|
: sprout::detail::equiv_adaptor_impl<sprout::less<> >(comp)
|
|
{}
|
|
};
|
|
|
|
//
|
|
// equiv
|
|
//
|
|
template<typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::equiv_adaptor<Compare>
|
|
equiv(Compare const& comp) {
|
|
return sprout::equiv_adaptor<Compare>(comp);
|
|
}
|
|
inline SPROUT_CONSTEXPR sprout::equiv_adaptor<>
|
|
equiv() {
|
|
return sprout::equiv_adaptor<>();
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_FUNCTIONAL_EQUIV_HPP
|