chromium/third_party/libc++/src/include/__algorithm/three_way_comp_ref_type.h

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
#define _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H

#include <__assert>
#include <__compare/ordering.h>
#include <__config>
#include <__utility/declval.h>
#include <__utility/forward.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

template <class _Comp>
struct __debug_three_way_comp { … };

// Pass the comparator by lvalue reference. Or in the debug mode, using a debugging wrapper that stores a reference.
#  if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
template <class _Comp>
using __three_way_comp_ref_type = __debug_three_way_comp<_Comp>;
#  else
__three_way_comp_ref_type;
#  endif

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H