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ok, i have a class that has a const in it and uses it within it's member functions...i want to make it non constant but i cannot change the class. the ONLY thing i want different about the class is changing that to a non-constant. i was wondering if i could hack around this using inheritance?
you mean make one private member non-const for some reason?
well i really dont understand your question, but you can use "const_cast", to "convert temporaly" that value or object to non-const
Given that it is possible to change the constant member variable, is it accessible? Where are you accessing that variable?
Kuphryn
does that clearify what i want?Code:class foo
{
public:
static const int x = 8;
};
int foo::dosomething(){ while(i++ < x); return i; }
int bar::blah(){
foo a;
foo::x = 6;
return a.dosomething();
}
doing return a.dosomething() - 2; will not suffice
This is a bad idea. The const is there for a reason. If you can't change the code in the class, you shouldn't be changing the constant.Code:class foo
{
public:
static const int x = 8;
};
int foo::dosomething(){ while(i++ < x); return i; }
int bar::blah(){
foo a;
const_cast<int&>(foo::x) = 6;
return a.dosomething();
}
Let me preface by saying that it might depend on your compiler because depending on which you're using, a static const may be treated as a constant (calculated at compile time) and as such, it can not be modified. It can be likened to wanting to do this:
But generally speaking, you won't be able to do what you're asking.Code:class foo
{
public:
// x compiled into 8
};
int foo::dosomething(){ while(i++ < 8); return i; }
int bar::blah(){
foo a;
8 = 6;
return a.dosomething();
}
i know it's a bad idea. i hate to give away any clues to my ultra top secret algorthm which will anihilate everyone in the connect four contest, but i've found an ingenius way to use the checkWin() function if only i could get toWin's value to change. so i was wondering if somehow i could inherit Board and use polymorphism or something to be able to change the value of toWin.
I think you're going to have to do more work than that.
Why don't you try duplicating the checkWin code but without the const on the toWin part?
there's size constraints isn't there?
i have more code in mind than just that, but it would be very helpful
No, I don't think there is a size constraint for the code in that contest (there is a size constraint for Quzah's sigmaze contest).
Besides, I don't think Sang-drax would like you cheating the interface like that. ;)
I'd suggest doing it the right way. The code for checking for a win is right there, just copy it and modify it to suit your needs.
In fact, the only private or protected data used in that function is lastX and lastY, which you should know since you made the move.
If you must, ask Sang-drax if the Board code can be changed to allow a variable toWin value.
i was just trying to whip something up because i just found the contest thread yesterday and there's only 10 days left..
i figured i might as well, cheat...ermm, 'use the function creatively' because i'm going to lose anyway
Understood. However, I always thought one of the reasons to do those contests was to test your abilities and try to improve your skills. The connect four contest is nice in that it doesn't restrict code size in any way, so you can try to make the best possible code. If you don't expect to win, then writing better code than usual or trying to learn something are admirable goals.
Creative, but it will get you disqualified :)Quote:
Originally Posted by misplaced
Not because of cheating, but because your code yields undefined behaviour. :)
There is no code size constraint, only a somewhat vague execution time constraint.Quote:
Originally Posted by jlou
Hey now!!! That wasn't my quote! :)Quote:
Originally Posted by Sang-drax
Don't sully my reputation. ;)