"red floyd" <no*****@here.dude> wrote in message
news:SE*********************@newssvr13.news.prodig y.com...
jeffc wrote: "Larry Lindsey" <gt*****@prism.gatech.edu> wrote in message
news:bk**********@news-int.gatech.edu...
If I have classes Parent, Child, and Seat as follows
class Parent{
public:
float getValue(){return 0;}
...
}
class Child: public Parent{
public:
float getValue(){return val;}
...
private:
float val;
}
class Seat{
public:
Parent* getPerson(){
return thePerson;
}
void setPerson(Parent *inPerson){
thePerson=inPerson;
}
...
private:
Parent* thePerson;
}
If i do this:
Child *c = new Child();
Seat *s = new Seat();
Child->setValue(12);
Did you forget to define this function?
s->setPerson(c);
How would I make s->getPerson()->getValue() return 12, and not 0?
Read up on virtual functions.
In other words, because Parent::getValue() is non-virtual, and getPerson
returns a Parent*, any reference to getValue() through getPerson() will
access Parent::getValue().
If you declare getValue() as virtual in Parent(), then it will behave in
the polymorphic manner that you desire.
I've made everything virtual that needs to be virtual, but now I'm having a
problem where private variables aren't keeping their values. Does anyone
know whats going on?
for instance, in the above example, after I call c->setValue(12), were I to
call c->getValue(), it would return -8.4873e+008, which I'm pretty sure is
2's complement 0x000000 for some number of 0's.
Thanks for all of you help thus far, btw.
