[libcxx-commits] [libcxx] [libc++] implement adjacent_view (PR #165089)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions ,h,inc,cpp -- libcxx/include/__ranges/adjacent_view.h libcxx/include/__ranges/zip_utils.h libcxx/test/std/ranges/range.adaptors/range.adjacent/adaptor.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/base.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/begin.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/borrowing.compile.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/ctor.default.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/ctor.views.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/end.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/general.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/helpers.h libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/arithmetic.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/compare.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/ctor.default.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/ctor.other.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/decrement.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/deref.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/increment.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/iter_move.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/iter_swap.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/member_types.compile.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/singular.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/subscript.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/range.concept.compile.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/sentinel/ctor.default.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/sentinel/ctor.other.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/sentinel/eq.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/sentinel/minus.pass.cpp libcxx/test/std/ranges/range.adaptors/range.adjacent/size.pass.cpp libcxx/include/__ranges/zip_view.h libcxx/include/ranges libcxx/modules/std/ranges.inc libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp libcxx/test/std/ranges/range.adaptors/range.join/adaptor.pass.cpp libcxx/test/std/ranges/range.adaptors/range.zip.transform/sentinel/minus.pass.cpp libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/minus.pass.cpp libcxx/test/std/ranges/range.adaptors/range_adaptor_types.h libcxx/test/std/ranges/ranges_robust_against_no_unique_address.pass.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/libcxx/test/std/ranges/range.adaptors/range.join/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.join/adaptor.pass.cpp
index 10c092cf3..e990ffa29 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.join/adaptor.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.join/adaptor.pass.cpp
@@ -21,10 +21,10 @@
 struct MoveOnlyView : SimpleForwardCommonOuter<ForwardCommonInner> {
   using SimpleForwardCommonOuter<ForwardCommonInner>::SimpleForwardCommonOuter;
 
-  constexpr MoveOnlyView(MoveOnlyView&&) = default;
+  constexpr MoveOnlyView(MoveOnlyView&&)      = default;
   constexpr MoveOnlyView(const MoveOnlyView&) = delete;
 
-  constexpr MoveOnlyView& operator=(MoveOnlyView&&) = default;
+  constexpr MoveOnlyView& operator=(MoveOnlyView&&)      = default;
   constexpr MoveOnlyView& operator=(const MoveOnlyView&) = delete;
 };
 
@@ -51,7 +51,7 @@ constexpr bool test() {
   {
     // Test `views::join(move-only-view)`
     ForwardCommonInner inners[3] = {buffer1, buffer2, buffer3};
-    using Result = std::ranges::join_view<MoveOnlyView>;
+    using Result                          = std::ranges::join_view<MoveOnlyView>;
     std::same_as<Result> decltype(auto) v = std::views::join(MoveOnlyView{inners});
     assert(std::ranges::next(v.begin(), 9) == v.end());
     assert(&(*v.begin()) == buffer1);
@@ -86,7 +86,7 @@ constexpr bool test() {
   {
     // Test `move-only-view | views::join`
     ForwardCommonInner inners[3] = {buffer1, buffer2, buffer3};
-    using Result = std::ranges::join_view<MoveOnlyView>;
+    using Result                          = std::ranges::join_view<MoveOnlyView>;
     std::same_as<Result> decltype(auto) v = MoveOnlyView{inners} | std::views::join;
     assert(std::ranges::next(v.begin(), 9) == v.end());
     assert(&(*v.begin()) == buffer1);

``````````

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https://github.com/llvm/llvm-project/pull/165089