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06ee65af9e
release/18.x branch, commit 78b99c73ee4b96fe9ce0e294d4632326afb2db42 This adds the flag `-D_LIBCPP_HARDENING_MODE` which is determined based on the Zig optimization mode. This commit also fixes libunwind, libcxx, and libcxxabi to properly report sub compilation errors.
59 lines
1.5 KiB
C++
Vendored
59 lines
1.5 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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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_SHIFT_LEFT_H
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#define _LIBCPP___ALGORITHM_SHIFT_LEFT_H
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#include <__algorithm/move.h>
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#include <__config>
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#include <__iterator/iterator_traits.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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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template <class _ForwardIterator>
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inline _LIBCPP_HIDE_FROM_ABI constexpr _ForwardIterator
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shift_left(_ForwardIterator __first,
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_ForwardIterator __last,
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typename iterator_traits<_ForwardIterator>::difference_type __n) {
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if (__n == 0) {
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return __last;
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}
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_ForwardIterator __m = __first;
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if constexpr (__has_random_access_iterator_category<_ForwardIterator>::value) {
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if (__n >= __last - __first) {
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return __first;
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}
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__m += __n;
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} else {
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for (; __n > 0; --__n) {
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if (__m == __last) {
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return __first;
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}
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++__m;
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}
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}
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return std::move(__m, __last, __first);
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}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_SHIFT_LEFT_H
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