[libcxx-commits] [libcxx] [libc++] Implement P1901R2: owner_hash and owner_equal for shared_ptr/weak_ptr (PR #210551)

[A. Jiang via libcxx-commits]

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@@ -1318,6 +1351,44 @@ struct owner_less<void> {
 };
 #endif
 
+#if _LIBCPP_STD_VER >= 26
+struct owner_hash {
+  template <class _Tp>
+  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI size_t operator()(shared_ptr<_Tp> const& __p) const _NOEXCEPT {
+    return __p.owner_hash();
+  }
+  template <class _Tp>
+  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI size_t operator()(weak_ptr<_Tp> const& __p) const _NOEXCEPT {
+    return __p.owner_hash();
+  }
+  typedef void is_transparent;
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frederick-vs-ja wrote:

Same for `owner_equal`.
```suggestion

  using is_transparent = void;
```
(Also, it seems a bit clear to add an empty line here).

https://github.com/llvm/llvm-project/pull/210551