Copy Constructor Quiz-Asked in Interviews.

When is a Copy constructor is invoked?

A) Instance of a class is Created

B) Argument is passed by reference

C) Argument is passed by reference

D) Function returns by value

Solution: D is correct

In C++, a Copy Constructor may be called for the following cases:
1) When an object of the class is returned by value. 
2) When an object of the class is passed (to a function) by value as an argument. 
3) When an object is constructed based on another object of the same class. 
4) When the compiler generates a temporary object.

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