[libcxx-commits] [libcxx] [libc++][pstl] Default implementation of parallel std::adjacent_difference (PR #207585)

[Louis Dionne via libcxx-commits]

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@@ -529,6 +530,34 @@ struct __rotate_copy<__default_backend_tag, _ExecutionPolicy> {
   }
 };
 
+template <class _ExecutionPolicy>
+struct __adjacent_difference<__default_backend_tag, _ExecutionPolicy> {
+  template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _BinaryOperation>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardIterator2>
+  operator()(_Policy&& __policy,
+             _ForwardIterator1 __first1,
+             _ForwardIterator1 __last1,
+             _ForwardIterator2 __first2,
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ldionne wrote:

I would suggest calling this `__out` or `__dest` or `__result`. Non-blocking, just a preference.

https://github.com/llvm/llvm-project/pull/207585