79 lines
2.3 KiB
C++
79 lines
2.3 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___ALGORITHM_COMP_REF_TYPE_H
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#define _LIBCPP___ALGORITHM_COMP_REF_TYPE_H
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#include <__assert>
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#include <__config>
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#include <__utility/declval.h>
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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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template <class _Compare>
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struct __debug_less
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{
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_Compare &__comp_;
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_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI __debug_less(_Compare& __c) : __comp_(__c) {}
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template <class _Tp, class _Up>
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_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI
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bool operator()(const _Tp& __x, const _Up& __y)
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{
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bool __r = __comp_(__x, __y);
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if (__r)
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__do_compare_assert(0, __y, __x);
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return __r;
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}
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template <class _Tp, class _Up>
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_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI
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bool operator()(_Tp& __x, _Up& __y)
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{
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bool __r = __comp_(__x, __y);
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if (__r)
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__do_compare_assert(0, __y, __x);
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return __r;
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}
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template <class _LHS, class _RHS>
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_LIBCPP_CONSTEXPR_SINCE_CXX14
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inline _LIBCPP_INLINE_VISIBILITY
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decltype((void)std::declval<_Compare&>()(
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std::declval<_LHS &>(), std::declval<_RHS &>()))
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__do_compare_assert(int, _LHS & __l, _RHS & __r) {
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_LIBCPP_ASSERT_UNCATEGORIZED(!__comp_(__l, __r),
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"Comparator does not induce a strict weak ordering");
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(void)__l;
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(void)__r;
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}
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template <class _LHS, class _RHS>
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_LIBCPP_CONSTEXPR_SINCE_CXX14
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inline _LIBCPP_INLINE_VISIBILITY
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void __do_compare_assert(long, _LHS &, _RHS &) {}
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};
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// Pass the comparator by lvalue reference. Or in debug mode, using a
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// debugging wrapper that stores a reference.
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#if _LIBCPP_ENABLE_DEBUG_MODE
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template <class _Comp>
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using __comp_ref_type = __debug_less<_Comp>;
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#else
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template <class _Comp>
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using __comp_ref_type = _Comp&;
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_COMP_REF_TYPE_H
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