std::weak_ptr<T>::use_count
From cppreference.com
long use_count() const noexcept; |
(since C++11) | |
Returns the number of shared_ptr
instances that share ownership of the managed object, or 0 if the managed object has already been deleted, i.e. *this is empty.
Contents |
[edit] Parameters
(none)
[edit] Return value
The number of shared_ptr
instances sharing the ownership of the managed object at the instant of the call.
[edit] Notes
expired() may be faster than use_count()
. This function is inherently racy, if the managed object is shared among threads that might be creating and destroying copies of the shared_ptr
: then, the result is reliable only if it matches the number of copies uniquely owned by the calling thread, or zero; any other value may become stale before it can be used.
[edit] Example
This section is incomplete Reason: no example |
[edit] See also
checks whether the referenced object was already deleted (public member function) |