copy construktor

[Tony Johansson]

Hello Experts!

I have the definition of class Integer below and a main.
Now to my question in main below I have statement (1) which is Integer m =
k.clone(); but actually as I think
statement(1) and statement(2) and statement(3) does mean exactly the same
thing. I'm I right?
(1)Integer m = k.clone();
(2)Integer m(k); //copy constructor
(3)Integer m = k; //another way of writing a copy constructor

main()
{
Integer k(5);
Integer m = k.clone();
}

class Integer
{
public:
Integer(int n= 0)
{
value = n;
}

Integer clone() const
{
Integer res(value);
return res;
}
private:
int value;
};

Many thanks!

//Tony

 

[BigBrian]

No, calling your clone creates a temporary Integer object, but
constructing m as a copy of another object, through the copy
constructor, doesn't create a temporary.

-Brian

 

[Tony Johansson]

Hello!

But I think the result will be the same for the three statements.

 

[BigBrian]

Well, that you can check by compiling and running your code. I guess I
thought you were asking a deeper question.

 

[Rolf Magnus]

Hello!

But I think the result will be the same for the three statements.

Well, you asked whether they "mean exactly the same thing", and they don't.
But you're right that the result in your example will be the same.