e9280a1d39
Previously, the segmented iterator optimization for `std::for_each` was restricted to C++23 and later due to its dependency on `__movable_box`, which is not available in earlier standards. This patch eliminates that restriction, enabling consistent optimizations starting from C++11. By backporting this enhancement, we improve performance across older standards and create opportunities to extend similar optimizations to other algorithms by forwarding their calls to `std::for_each`.
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_FOR_EACH_H
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#define _LIBCPP___ALGORITHM_FOR_EACH_H
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#include <__algorithm/for_each_segment.h>
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#include <__config>
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#include <__iterator/segmented_iterator.h>
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#include <__type_traits/enable_if.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 _InputIterator, class _Sent, class _Func>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __for_each(_InputIterator __first, _Sent __last, _Func& __f) {
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for (; __first != __last; ++__first)
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__f(*__first);
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}
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#ifndef _LIBCPP_CXX03_LANG
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template <class _SegmentedIterator,
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class _Function,
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__enable_if_t<__is_segmented_iterator<_SegmentedIterator>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
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__for_each(_SegmentedIterator __first, _SegmentedIterator __last, _Function& __func) {
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using __local_iterator_t = typename __segmented_iterator_traits<_SegmentedIterator>::__local_iterator;
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std::__for_each_segment(__first, __last, [&](__local_iterator_t __lfirst, __local_iterator_t __llast) {
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std::__for_each(__lfirst, __llast, __func);
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});
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}
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#endif // !_LIBCPP_CXX03_LANG
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template <class _InputIterator, class _Function>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Function
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for_each(_InputIterator __first, _InputIterator __last, _Function __f) {
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std::__for_each(__first, __last, __f);
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return __f;
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_FOR_EACH_H
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