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shared_ptr assignment The copy assignments (1) adds the object as a shared owner of x 's assets, increasing their use_count . The move assignments (2) transfer ownership from x to the shared_ptr object without altering the use_count . If you define your own assignment operators, the compiler will not automatically call your base class’s assignment operators for you. Unless your base class’s assignment operators themselves are broken, you should call them explicitly from your derived class’s assignment operators (again, assuming you create them in the first place). Jan 27, 2010 · remaining lines are assignment operators which can also throw. HOWEVER, if you have a type T for which the default std::swap() may result in either T's copy constructor or assignment operator throwing, you are politely required to provide a swap() overload for your type that does not throw. Assignment operator called Copy constructor called. Copy constructor is called when a new object is created from an existing object, as a copy of the existing object (see this G-Fact). And assignment operator is called when an already initialized object is assigned a new value from another existing object.