On 2009-02-10 08:02:31 -0500, Kagamin <[email protected]> said:
Well, you can pass descendant objects :) I was surprised by this
destructive feature. But code is still not polymorphic. Consider the
following code:
class C
{
public:
virtual char* doSomething( C src )
{
return src.Method();
}
virtual char* Method()
{
return "It's C.";
}
};
class C2 : public C
{
public:
virtual char* Method()
{
return "It's C2.";
}
};
int main(void)
{
C c;
C2 c2;
printf("%s\n",c.doSomething(c));
printf("%s\n",c.doSomething(c2));
return 0;
}
What do you think is its output?
Since you're passing c2 as a C by value to doSomething, slicing do
occur and it prints "It's C." two times. That's why in C++ we generally
pass objects by reference. Unfortunately, you often can't do that for
return values..
--
Michel Fortin
[email protected]
http://michelf.com/
