Update libc++ to 8f0b2ac1 (12 Feb 2022).

Notable changes:
* use [[no_unique_address]] for field `__base_` in join_view
* remove _LIBCPP_HIDE_FROM_ABI from __threading_support functions
* remove __functional_base header which is just a set of #include directives
* remove unused include in ranges_swap_ranges.h
* do not print bools with "c" format.
* add noexcept to basic_format_context::arg constructor
* add ranges::min_element
* add ranges::in_fun_result
* add ranges::swap_ranges
* add std::vector::reference::operator=(bool) const
* replace _LIBCPP_DEBUG with _LIBCPP_DEBUG_LEVEL
* fix constexpr in __debug_less
* modernize code in compress_pair.h
* add permutable concept
* cleanup format headers
* remove _LIBCPP_ABI_UNSTABLE, we must set _LIBCPP_ABI_VERSION and _LIBCPP_ABI_NAMESPACE outselves now
* make some members private in experimental/functional
* remove std::nullptr_t emulation in C++03 mode

ref:f3c7583f32067a3dd9da42aeb15f1b01d746dc59

1 files changed, 24 insertions, 7 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/algorithm b/contrib/libs/cxxsupp/libcxx/include/algorithm
index 2537e882a1..e4aba31567 100644
--- a/contrib/libs/cxxsupp/libcxx/include/algorithm
+++ b/contrib/libs/cxxsupp/libcxx/include/algorithm
@@ -19,6 +19,9 @@ namespace std
 {
 
 namespace ranges {
+  template <class I, class F>
+    struct in_fun_result; // since C++20
+
   template <class I1, class I2>
     struct in_in_result;     // since C++20
 
@@ -27,6 +30,14 @@ namespace ranges {
 
   template <class I, class O1, class O2>
     struct in_out_out_result; // since C++20
+
+  template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
+    indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>             // since C++20
+  constexpr I min_element(I first, S last, Comp comp = {}, Proj proj = {});
+
+  template<forward_range R, class Proj = identity,
+    indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less> // since C++20
+  constexpr borrowed_iterator_t<R> min_element(R&& r, Comp comp = {}, Proj proj = {});
 }
 
 template <class InputIterator, class Predicate>
@@ -199,6 +210,16 @@ template <class ForwardIterator1, class ForwardIterator2>
     constexpr ForwardIterator2    // constexpr in C++20
     swap_ranges(ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2);
 
+template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2>
+        requires indirectly_swappable<I1, I2>
+    constexpr ranges::swap_ranges_result<I1, I2>
+        ranges::swap_ranges(I1 first1, S1 last1, I2 first2, S2 last2);
+
+template<input_range R1, input_range R2>
+        requires indirectly_swappable<iterator_t<R1>, iterator_t<R2>>
+    constexpr ranges::swap_ranges_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
+        ranges::swap_ranges(R1&& r1, R2&& r2);
+
 template <class ForwardIterator1, class ForwardIterator2>
     constexpr void                // constexpr in C++20
     iter_swap(ForwardIterator1 a, ForwardIterator2 b);
@@ -651,13 +672,6 @@ template <class BidirectionalIterator>
 template <class BidirectionalIterator, class Compare>
     constexpr bool     // constexpr in C++20
     prev_permutation(BidirectionalIterator first, BidirectionalIterator last, Compare comp);
-
-namespace ranges {
-// [algorithms.results], algorithm result types
-template<class InputIterator, class OutputIterator>
-    struct in_out_result;
-}
-
 }  // std
 
 */
@@ -702,6 +716,7 @@ template<class InputIterator, class OutputIterator>
 #include <__algorithm/generate.h>
 #include <__algorithm/generate_n.h>
 #include <__algorithm/half_positive.h>
+#include <__algorithm/in_fun_result.h>
 #include <__algorithm/in_in_out_result.h>
 #include <__algorithm/in_in_result.h>
 #include <__algorithm/in_out_out_result.h>
@@ -739,6 +754,8 @@ template<class InputIterator, class OutputIterator>
 #include <__algorithm/pop_heap.h>
 #include <__algorithm/prev_permutation.h>
 #include <__algorithm/push_heap.h>
+#include <__algorithm/ranges_min_element.h>
+#include <__algorithm/ranges_swap_ranges.h>
 #include <__algorithm/remove.h>
 #include <__algorithm/remove_copy.h>
 #include <__algorithm/remove_copy_if.h>