Operator Overloading
Question Text
How many constructor calls, copy constructor calls, assignment operator calls and destructor calls does the following program issue?
Obj quiz(Obj o1, Obj o2)
{
o2 = o1;
return o2;
}
void main()
{
Obj b = quiz(o1, o2);
}
Question Answers
- constructor calls = 0, copy constructor calls = 3, assignment operator calls = 1, destructor calls = 3
constructor calls = 1, copy constructor calls = 2, assignment operator calls = 1, destructor calls = 2
constructor calls = 0, copy constructor calls = 2, assignment operator calls = 1, destructor calls = 2
constructor calls = 0, copy constructor calls = 3, assignment operator calls = 1, destructor calls = 1
Feedback
There are no constructor calls because there is no object construction when using
int
.There are 3 copy constructor calls: for passing
o1
, for passingo2
, and for returningo2
.There is 1 assignment operator call for
o2 = o1
.There are 3 destructor calls, because each constructed object needs to be destroyed.