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std::owner_hash(3) C++ Standard Libary std::owner_hash(3) NAME std::owner_hash - std::owner_hash Synopsis Defined in header <memory> struct owner_hash; (since C++26) This function object provides owner-based (as opposed to value- based) hashing of both std::weak_ptr and std::shared_ptr. Member functions operator() calculates the hash of the shared-ownership pointer (function) std::owner_hash::operator() template< class T > std::size_t operator()( const std::shared_ptr<T>& key ) const (1) (since C++26) noexcept; template< class T > std::size_t operator()( const std::weak_ptr<T>& key ) const (2) (since C++26) noexcept; Equivalent to return key.owner_hash();. Parameters key - shared-ownership pointer to be hashed Return value A hash value that is identical for any std::shared_ptr or std::weak_ptr object sharing the same ownership. Notes Feature-test macro Value Std Fea- ture Enabling the use of __cpp_lib_smart_ptr_owner_equality 202306L (C++26) std::shared_ptr and std::weak_ptr as keys in un- ordered associative containers See also owner_hash provides owner-based hashing of shared pointers (C++26) (public member function of std::shared_ptr<T>) owner_hash provides owner-based hashing of weak pointers (C++26) (public member function of std::weak_ptr<T>) http://cppreference.com 2024.06.10 std::owner_hash(3)
NAME | Synopsis | Member functions | Parameters | Return value | Notes | See also
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