WHEN A COPY CONSTER IS CALL ?

Question Posted / ashis

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WHEN A COPY CONSTER IS CALL ? ..

Answer / preeti

There are 3 important places where a copy constructor is
called.

When an object is created from another object of the same
type
When an object is passed by value as a parameter to a
function
When an object is returned from a function

class A //With copy constructor
{
private:
char *name;
public:
A()
{
name = new char[20];
}
~A()
{
delete name[];
}
//Copy constructor
A(const A &b)
{
name = new char[20];
strcpy(name, b.name);
}
};

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9 Yes

0 No

WHEN A COPY CONSTER IS CALL ? ..

Answer / achal ubbott

Question on copy constructor is a classic one for an
interview. Since most modern day c++ compilers provide a
default copy constructor, most people don't get to try
hands over it. But in some cases it becomes mandatory to
define your own copy constructor and override the default
one.
So the places when CC is invoked are:-

1. calling a function e.g. void f(sample A);

2. creating an object from the existing object.
e.g. sample A=B; // here B is existing object.

3. When a function returns a copy of object.

e.g. sample f()
{
sample a;
return a;
}

Is This Answer Correct ?

2 Yes

0 No

WHEN A COPY CONSTER IS CALL ? ..

Answer / vishwa

emp e;//default constr
emp e(10);//paramatrisized constr
emp e(e1);//copy constr
emp e = e1;//copy constr

Is This Answer Correct ?

2 Yes

0 No

WHEN A COPY CONSTER IS CALL ? ..

Answer / muthu_tek

emp e;//default constr
emp e(10);//paramatrisized constr
emp e(e1);//copy constr

Is This Answer Correct ?

1 Yes

4 No

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