NAME

std::weak_ptr::owner_hash - std::weak_ptr::owner_hash

Synopsis

std::size_t owner_hash() const noexcept; (since C++26)

Returns an unspecified value such that for any object other where owner_equal(other)
is true, owner_hash() == other.owner_hash() is true.

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

Return value

A value that is identical for any std::shared_ptr or std::weak_ptr object sharing
the same ownership.

Notes

Feature-test macro Value Std Feature
Enabling the use of std::weak_ptr
__cpp_lib_smart_ptr_owner_equality 202306L (C++26) as keys in unordered associative
containers

Example

This section is incomplete
Reason: example

See also

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

Category:

* Todo with reason