[util.smartptr.owner.equal]

The class owner_equal provides ownership-based mixed equality comparisons of shared and weak pointers.

namespace std { struct owner_equal { template<class T, class U> bool operator()(const shared_ptr<T>&, const shared_ptr<U>&) const noexcept; template<class T, class U> bool operator()(const shared_ptr<T>&, const weak_ptr<U>&) const noexcept; template<class T, class U> bool operator()(const weak_ptr<T>&, const shared_ptr<U>&) const noexcept; template<class T, class U> bool operator()(const weak_ptr<T>&, const weak_ptr<U>&) const noexcept; using is_transparent = unspecified; }; }

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template<class T, class U>
  bool operator()(const shared_ptr<T>& x, const shared_ptr<U>& y) const noexcept;
template<class T, class U>
  bool operator()(const shared_ptr<T>& x, const weak_ptr<U>& y) const noexcept;
template<class T, class U>
  bool operator()(const weak_ptr<T>& x, const shared_ptr<U>& y) const noexcept;
template<class T, class U>
  bool operator()(const weak_ptr<T>& x, const weak_ptr<U>& y) const noexcept;

20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.2 Shared-ownership pointers [util.sharedptr]

20.3.2.6 Struct owner_equal [util.smartptr.owner.equal]