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      std::weak_ptr<T>::owner_hash

      From cppreference.com
      <cpp‎ |memory‎ |weak ptr

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      Memory management library
      (exposition only*)
      Allocators
      Uninitialized memory algorithms
      Constrained uninitialized memory algorithms
      Memory resources
      Uninitialized storage(until C++20)
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      (C++11)(until C++23)
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      std::size_t owner_hash()constnoexcept;
      		(since C++26)

      Returns an unspecified value such that for any objectother whereowner_equal(other) istrue,owner_hash()== other.owner_hash() istrue.

      This hashing is used to make shared and weak pointers usable as keys in unordered associative containers, typically throughstd::owner_hash.

      Contents

      [edit]Return value

      A value that is identical for anystd::shared_ptr orstd::weak_ptr object sharing the same ownership.

      [edit]Notes

      Feature-test macroValueStdFeature
      __cpp_lib_smart_ptr_owner_equality202306L(C++26)Enabling the use ofstd::weak_ptr as keys inunordered associative containers

      [edit]Example

      This section is incomplete
      Reason: example

      [edit]See also

      (C++26)
      		 provides owner-based hashing for shared and weak pointers
      (class)[edit]
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