Assume class DEMO. Which of the following statement(s) responsible to invoke copy constructor?1. DEMO D2(D1); // Here D1 is an already created object of class DEMO2. D2 = D1; // Here D1, D2 are already created objects of class DEMOThis problem has only one correct answerOnly 1Only 2Both 1 and 2
Question
Assume class DEMO. Which of the following statement(s) responsible to invoke copy constructor?1. DEMO D2(D1); // Here D1 is an already created object of class DEMO2. D2 = D1; // Here D1, D2 are already created objects of class DEMOThis problem has only one correct answerOnly 1Only 2Both 1 and 2
Solution
Only 1
The copy constructor in C++ is invoked in the following cases:
- When an object of the class is returned by value.
- When an object of the class is passed (to a function) by value as an argument.
- When an object is constructed based on another object of the same class.
So, in the given options, the statement "DEMO D2(D1);" is responsible to invoke the copy constructor as it is creating a new object D2 based on an already created object D1 of the same class DEMO.
The statement "D2 = D1;" is not invoking the copy constructor. It is actually calling the assignment operator. Here, both D1 and D2 are already created objects of class DEMO, and the contents of D1 are being assigned to D2.
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