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Video of Advanced C++: Resource Managing Class in OOP course by Bo Qian channel, video No. 13 free certified online
This video talks about an important resource management pitfall in C++ 03 (C++ 11 is not discussed here). When you class owns another object by its pointer, you should either: a) define deep copying for copy constructor and assignment operator; b) delete copy constructor and assignment operator, and use clone() function.
As Klemens kindly pointed out: at 5:40, the accessor is not needed as it is accessed only by the same class.