llvm-capstone/libcxx/include/__algorithm/next_permutation.h
Louis Dionne 9783f28cbb
[libc++] Format the code base (#74334)
This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmarks, the test suite and remaining parts of the code. I'm
splitting this one into its own patch so the diff is a bit easier to
review.

This patch was generated with:

   find libcxx/include libcxx/src -type f \
      | grep -v 'module.modulemap.in' \
      | grep -v 'CMakeLists.txt' \
      | grep -v 'README.txt' \
      | grep -v 'libcxx.imp' \
      | grep -v '__config_site.in' \
      | xargs clang-format -i

A Git merge driver is available in libcxx/utils/clang-format-merge-driver.sh
to help resolve merge and rebase issues across these formatting changes.

[1]: https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all
2023-12-18 14:01:33 -05:00

71 lines
2.5 KiB
C++

//===----------------------------------------------------------------------===//
//
// 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_NEXT_PERMUTATION_H
#define _LIBCPP___ALGORITHM_NEXT_PERMUTATION_H
#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/reverse.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _AlgPolicy, class _Compare, class _BidirectionalIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator, bool>
__next_permutation(_BidirectionalIterator __first, _Sentinel __last, _Compare&& __comp) {
using _Result = pair<_BidirectionalIterator, bool>;
_BidirectionalIterator __last_iter = _IterOps<_AlgPolicy>::next(__first, __last);
_BidirectionalIterator __i = __last_iter;
if (__first == __last || __first == --__i)
return _Result(std::move(__last_iter), false);
while (true) {
_BidirectionalIterator __ip1 = __i;
if (__comp(*--__i, *__ip1)) {
_BidirectionalIterator __j = __last_iter;
while (!__comp(*__i, *--__j))
;
_IterOps<_AlgPolicy>::iter_swap(__i, __j);
std::__reverse<_AlgPolicy>(__ip1, __last_iter);
return _Result(std::move(__last_iter), true);
}
if (__i == __first) {
std::__reverse<_AlgPolicy>(__first, __last_iter);
return _Result(std::move(__last_iter), false);
}
}
}
template <class _BidirectionalIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp) {
return std::__next_permutation<_ClassicAlgPolicy>(
std::move(__first), std::move(__last), static_cast<__comp_ref_type<_Compare> >(__comp))
.second;
}
template <class _BidirectionalIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last) {
return std::next_permutation(__first, __last, __less<>());
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_NEXT_PERMUTATION_H