forked from OSchip/llvm-project
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H
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#define _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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template<class, class, class>
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struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result { };
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template<class _Tp, class _Up>
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struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result<_Tp, _Up, decltype(
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declval<__make_const_lvalue_ref<_Tp>>() <=> declval<__make_const_lvalue_ref<_Up>>(), void()
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)> {
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using type = decltype(declval<__make_const_lvalue_ref<_Tp>>() <=> declval<__make_const_lvalue_ref<_Up>>());
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};
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template<class _Tp, class _Up = _Tp>
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struct _LIBCPP_TEMPLATE_VIS compare_three_way_result : __compare_three_way_result<_Tp, _Up, void> { };
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template<class _Tp, class _Up = _Tp>
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using compare_three_way_result_t = typename compare_three_way_result<_Tp, _Up>::type;
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H
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