classes - problems with a constructor

[paul23]

Well this is the very easy code I have now:

class game
{
public: 
    game(int ww,int hh, int ss=30)
    {
        playfield(ww,hh);
        w = ww;
        h = hh;
        step = ss;
    }
private:
    field playfield;
    int w,h,step;
};

Where field is aclass with a constructor that takes two integers as arguments..

Now I thought such a thing would work, but apparantly it doesn't (else I wouldn't post here...):
error C2512: 'field' : no appropriate default constructor available
error C2064: term does not evaluate to a function taking 2 arguments
Are the errors I see. So how would i go about this? - I want the objects "game" to have a private member "playfield" (which itself is an object from the class "field". Yet I want it to be "set" through the constructor (since I need to pass the width and height to it), I can't really fill in some "default" values as that wouldn't make sense at all.

[Zaita]

field playfield;

Class field needs a default constructor.

term does not evaluate to a function taking 2 arguments

What does the term function look like?

[paul23]

Uhm, well I "hoped" that part called the (non default) constructor.. Like I said: the constructor should initialize an array: and the width/height of that array is given from the main function (the one that also creates the "game" object).


So what I want is that "game" HAS_A "field", and that it "passes" the arguments width and height..

I know why, I get the problem: and what's causing it.. However I don't know how I could solve it...

[Zaita]

game(int ww,int hh, int ss=30) : playfield(ww,hh)
    {        
        w = ww;
        h = hh;
        step = ss;
    }

Edit: Personally, I'd use a pointer to field and then just use new in the constructor.

[helios]

You can't manually construct static members. If you need to pass parameters to the constructor, use pointers:

struct B{
    A *a;
    B(){
        a=new A(1,2);
    }
};

But what the compiler is complaining about is that, by declaring field::field(int,int), you, so to speak, undeclared the default constructor (field::field()) which is what the game::game(int,int,int) calls before the start of your code.

Edit: Oh... Slowpoke, me.