From 99aabd70801bd4bc72c4942747f6d62c675112f5 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 25 Dec 2023 14:49:57 +0100
Subject: Vendor import of llvm-project main
 llvmorg-18-init-15692-g007ed0dccd6a.

---
 libcxx/include/__algorithm/prev_permutation.h | 64 ++++++++++++---------------
 1 file changed, 28 insertions(+), 36 deletions(-)

(limited to 'libcxx/include/__algorithm/prev_permutation.h')

diff --git a/libcxx/include/__algorithm/prev_permutation.h b/libcxx/include/__algorithm/prev_permutation.h
index 4a6bf4a66439..3e4bbb3fbb16 100644
--- a/libcxx/include/__algorithm/prev_permutation.h
+++ b/libcxx/include/__algorithm/prev_permutation.h
@@ -25,52 +25,44 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _AlgPolicy, class _Compare, class _BidirectionalIterator, class _Sentinel>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
-pair<_BidirectionalIterator, bool>
-__prev_permutation(_BidirectionalIterator __first, _Sentinel __last, _Compare&& __comp)
-{
-    using _Result = pair<_BidirectionalIterator, bool>;
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator, bool>
+__prev_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);
+  _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(*__ip1, *--__i))
-        {
-            _BidirectionalIterator __j = __last_iter;
-            while (!__comp(*--__j, *__i))
-                ;
-            _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);
-        }
+  while (true) {
+    _BidirectionalIterator __ip1 = __i;
+    if (__comp(*__ip1, *--__i)) {
+      _BidirectionalIterator __j = __last_iter;
+      while (!__comp(*--__j, *__i))
+        ;
+      _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
-prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp)
-{
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp) {
   return std::__prev_permutation<_ClassicAlgPolicy>(
-      std::move(__first), std::move(__last), static_cast<__comp_ref_type<_Compare> >(__comp)).second;
+             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
-prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last)
-{
-    return std::prev_permutation(__first, __last, __less<>());
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last) {
+  return std::prev_permutation(__first, __last, __less<>());
 }
 
 _LIBCPP_END_NAMESPACE_STD
-- 
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