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 Hu Chunming
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/*!
@file
Defines concepts from the Standard library.
Copyright Louis Dionne 2013-2022
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_DETAIL_CONCEPTS_HPP
#define BOOST_HANA_DETAIL_CONCEPTS_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/detail/std_common_type.hpp>
#include <boost/hana/detail/void_t.hpp>
#include <type_traits>
namespace boost { namespace hana { namespace detail {
//! @cond
//////////////////////////////////////////////////////////////////////////
// EqualityComparable
//////////////////////////////////////////////////////////////////////////
template <typename T, typename U = T, typename = void>
struct EqualityComparable : std::false_type { };
template <typename T>
struct EqualityComparable<T, T, detail::void_t<
decltype(static_cast<T&&>(*(T*)0) == static_cast<T&&>(*(T*)0) ? 0:0),
decltype(static_cast<T&&>(*(T*)0) != static_cast<T&&>(*(T*)0) ? 0:0)
>> : std::true_type { };
template <typename T, typename U>
struct EqualityComparable<T, U, typename std::enable_if<
!std::is_same<T, U>::value, detail::void_t<
decltype(static_cast<T&&>(*(T*)0) == static_cast<U&&>(*(U*)0) ? 0:0),
decltype(static_cast<U&&>(*(U*)0) == static_cast<T&&>(*(T*)0) ? 0:0),
decltype(static_cast<T&&>(*(T*)0) != static_cast<U&&>(*(U*)0) ? 0:0),
decltype(static_cast<U&&>(*(U*)0) != static_cast<T&&>(*(T*)0) ? 0:0),
typename detail::std_common_type<T, U>::type
>>::type> : std::integral_constant<bool,
EqualityComparable<T>::value &&
EqualityComparable<U>::value &&
EqualityComparable<typename detail::std_common_type<T, U>::type>::value
> { };
//////////////////////////////////////////////////////////////////////////
// LessThanComparable
//////////////////////////////////////////////////////////////////////////
template <typename T, typename U = T, typename = void>
struct LessThanComparable : std::false_type { };
template <typename T>
struct LessThanComparable<T, T, detail::void_t<
decltype(static_cast<T&&>(*(T*)0) < static_cast<T&&>(*(T*)0) ? 0:0)
>> : std::true_type { };
template <typename T, typename U>
struct LessThanComparable<T, U, std::enable_if_t<
!std::is_same<T, U>::value,
detail::void_t<
decltype(static_cast<T&&>(*(T*)0) < static_cast<U&&>(*(U*)0) ? 0:0),
decltype(static_cast<U&&>(*(U*)0) < static_cast<T&&>(*(T*)0) ? 0:0),
typename detail::std_common_type<T, U>::type
>
>>
: std::integral_constant<bool,
LessThanComparable<T>::value &&
LessThanComparable<U>::value &&
LessThanComparable<typename detail::std_common_type<T, U>::type>::value
>
{ };
//! @endcond
} }} // end namespace boost::hana
#endif // !BOOST_HANA_DETAIL_CONCEPTS_HPP
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