Re: [Vala] how to declare multi-dimensional arrays in Genie?

[Ron Murawski <ron horizonchess com>]

 On 7/15/2010 6:50 PM, Jamie McCracken wrote:
> On Thu, 2010-07-15 at 18:34 -0400, Ron Murawski wrote:
> > On 7/15/2010 1:45 PM, Robert Powell wrote:
> > > > Both of the above multi-dimensional array declarations work as
> > > intended, but they do not seem to be global.
> > >
> > > Is this what you are trying to do?
> > >
> > > int [,] arr;
> > >
> > > public void main(string [] args) {
> > >      arr = new int[3,4];
> > >      arr[0,0] = 1;
> > >      arr[1,1] = 2;
> > >      stderr.printf("%d:%d\n", arr[0,0], arr[1,1]);
> > > }
> > >
> > > Hope that helps
> > Thanks, Robert! That's exactly what I was trying to accomplish, but I was
> > trying to do it all at compile-time.
> >
> > Hot diggety! I'm about to write a chess program in Genie! :-)
> >
> >
> > Here's Robert's example translated from Vala to Genie:
> >
> > [indent=4]
> > //int [,] arr;
> > arr : array of int[,]  // declare array name with global scope
> >
> > //public void main(string [] args) {
> > init
> >       //arr = new int[3,4];
> >       arr = new array of int[3,4]  // allocate the array
> >       arr[0,0] = 1;  // initialize it
> >       arr[1,1] = 2;
> >       stderr.printf("%d:%d\n", arr[0,0], arr[1,1]); // print it
> > //}
> >
> >
> >
> > I want to make certain I am understanding this correctly:
> >
> > 1. All multi-dimensional arrays in Vala/Genie *must* be allocated at
> > run-time,
> >      not at compile-time
> >
> > 2. Optionally, the multi-dimensional array name can be declared a global
> > name
> >
> >
> > Is this correct?
> if you mean you want to allocate multi dimensional arrays on the stack
> like ordinary arrays then i dont know if vala supports that
>
> If it does then it looks like a bug in Genie
>
> jamie
I wanted the multi-dimensional array in the data area, not on the stack.

In C:

int my_array[64][13];

int main(int argc, **char argv)
{
    my_array[7][7] = 7;
    // more stuff
    return 0;
}

The space for the array is reserved by the C compiler at compile-time in 
the data area, the array is guaranteed to be zeroed, and the name 
'my_array' is recognized globally by all modules, possibly with the help 
of extern statements.

I was trying to do the same in Vala/Genie, but this does not seem to be 
possible.

Best regards,
Ron