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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___ALGORITHM_FOR_EACH_SEGMENT_H |
| 10 | #define _LIBCPP___ALGORITHM_FOR_EACH_SEGMENT_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__iterator/segmented_iterator.h> |
| 14 | |
| 15 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 16 | # pragma GCC system_header |
| 17 | #endif |
| 18 | |
| 19 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 20 | |
| 21 | // __for_each_segment is a utility function for optimizing iterating over segmented iterators linearly. |
| 22 | // __first and __last are expected to be a segmented range. __func is expected to take a range of local iterators. |
| 23 | // Anything that is returned from __func is ignored. |
| 24 | |
| 25 | template <class _SegmentedIterator, class _Functor> |
| 26 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void |
| 27 | __for_each_segment(_SegmentedIterator __first, _SegmentedIterator __last, _Functor __func) { |
| 28 | using _Traits = __segmented_iterator_traits<_SegmentedIterator>; |
| 29 | |
| 30 | auto __sfirst = _Traits::__segment(__first); |
| 31 | auto __slast = _Traits::__segment(__last); |
| 32 | |
| 33 | // We are in a single segment, so we might not be at the beginning or end |
| 34 | if (__sfirst == __slast) { |
| 35 | __func(_Traits::__local(__first), _Traits::__local(__last)); |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | // We have more than one segment. Iterate over the first segment, since we might not start at the beginning |
| 40 | __func(_Traits::__local(__first), _Traits::__end(__sfirst)); |
| 41 | ++__sfirst; |
| 42 | // iterate over the segments which are guaranteed to be completely in the range |
| 43 | while (__sfirst != __slast) { |
| 44 | __func(_Traits::__begin(__sfirst), _Traits::__end(__sfirst)); |
| 45 | ++__sfirst; |
| 46 | } |
| 47 | // iterate over the last segment |
| 48 | __func(_Traits::__begin(__sfirst), _Traits::__local(__last)); |
| 49 | } |
| 50 | |
| 51 | _LIBCPP_END_NAMESPACE_STD |
| 52 | |
| 53 | #endif // _LIBCPP___ALGORITHM_FOR_EACH_SEGMENT_H |
| 54 |
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