@param p The raw pointer to assume ownership of. May be NULL.
@discussion Like shared_ptr, it is assumed that the caller has a strong reference to p and intends
to transfer ownership of that reference to this ref holder. If the object comes from
@param p The raw pointer to assume ownership of. May be NULL.
@discussion Like shared_ptr, it is assumed that the caller has a strong reference to p and intends
to transfer ownership of that reference to this ref holder. If the object comes from