Re: Question about using copy constructor of parent class?
In my book there is a question about "properly" creating a copy constructor
of child class during inheritance. Is it ok to use upcasting here ? I've
used upcasting and it seems to work fine.
#include <iostream>
using namespace std;
class A{
int a;
public:
A(int temp=0):a(temp){}
A(A& right):a(right.a){}
};
class B:public A{
int b;
public:
B(int temp=0):b(temp){}
B(B& right){A(*this);
b=right.b;
}
};
int main(){
B b;
B b1=b;
cin.get();
}
"Rolf Magnus" <ramagnus@t-online.de> wrote in message
news:e9ou38$mcu$02$1@news.t-online.com...
flamexx7 wrote:
In the programme below is it possible to call copy constructor of class
A,
inside copy constructor of class B.
Yes, but not for the current object. You can do that in the initializer
list.
#include <iostream>
using namespace std;
class A{
int a;
public:
A(int temp=0):a(temp){}
A(A& right):a(right.a){}
Should be:
A(const A& right):a(right.a){}
Or even better, just leave it out completely. The compiler will then
generate a copy constructor for you that does exactly the same.
};
class B:public A{
int b;
public:
B(int temp=0):b(temp){}
B(B& right){ A(right.A);
}
B(const B& right):A(right) {}
};
int main(){
}
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