Programming Interview: functions C++ generates automatically (constructor, copy, assignment)

This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA.

What are the functions that c++ generates automatically and calls.
What are default constructor, copy constructor, assignment operator, and default destructor.
What is the problem in defining some special constructor.

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[saurabhschool]

Thanks bluebeardic, yes you are correct, all those obj are pointers to class A, I have added annotations to make the correction in that video, thanks once again

[dhhsncnd]

As I remember c++ doesn't create a default constructor if a copy constructor is created explicitly.