[libc-commits] [libc] Implement libcxx ranges contains (PR #70258)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

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``````````bash
git-clang-format --diff 4c60c0cb4e3e7ac45f588499da8d674619d3845a 3e16ddebac3ddc424b88fd5c8fdc296dac3fab85 -- libcxx/include/__algorithm/ranges_contains.h libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
index 64a88e46f2c2..b606eb410dd2 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
@@ -153,16 +153,14 @@ constexpr void test_iterators() {
 }
 
 constexpr bool test() {
-  types::for_each(
-      types::type_list<char, short, int, long, long long>{},
-      []<class T> {
-        types::for_each(types::cpp20_input_iterator_list<T*>{}, []<class Iter> {
-          if constexpr (std::forward_iterator<Iter>)
-            test_iterators<Iter>();
-          test_iterators<Iter, sentinel_wrapper<Iter>>();
-          test_iterators<Iter, sized_sentinel<Iter>>();
-        });
-      });
+  types::for_each(types::type_list<char, short, int, long, long long>{}, []<class T> {
+    types::for_each(types::cpp20_input_iterator_list<T*>{}, []<class Iter> {
+      if constexpr (std::forward_iterator<Iter>)
+        test_iterators<Iter>();
+      test_iterators<Iter, sentinel_wrapper<Iter>>();
+      test_iterators<Iter, sized_sentinel<Iter>>();
+    });
+  });
 
   { // count invocations of the projection
     int a[]              = {1, 9, 0, 13, 25};

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https://github.com/llvm/llvm-project/pull/70258