bsl::enable_shared_from_this::weak_from_this

Declared in <bslstl_sharedptr.h>

Return a weak_ptr holding a weak reference to this managed object if this object is currently managed by shared_ptr, and return an expired weak_ptr otherwise. If multiple groups of shared_ptr`s are managing this object, the returned `weak_ptr will hold a weak reference to the group that first managed this object.

weak pointer observing this object, or expired if unmanaged

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