[util.smartptr.owner.hash]

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namespace std { struct owner_hash { template<class T> size_t operator()(const shared_ptr<T>&) const noexcept; template<class T> size_t operator()(const weak_ptr<T>&) const noexcept; using is_transparent = unspecified; }; }

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template<class T>
  size_t operator()(const shared_ptr<T>& x) const noexcept;
template<class T>
  size_t operator()(const weak_ptr<T>& x) const noexcept;

[Note 1:

For any object y where x.owner_equal(y) is true, x.owner_hash() == y.owner_hash() is true.

— end note]