Blitz2: Pointer to array

[idrougge]

While doing setup of a level, stored as an array of blocks, it would be helpful to have a pointer into that array, but I can't seem to figure out the correct usage of * and & and (), or need I resort to peek and poke?

[Cylon]

What are 'blocks'?
The address of an array something() is &something(0), the pointer to the first entry.
Or, do you have a newtype you made your array of?
Anyway:

; Blitz 2 Array pointer test
CloseEd

as.w=10

Dim array.w (as)      ;words, 2bytes

na.l =0
ona.l=0

NPrint""

For a = 0 To as-1

  na.l = &array(a)

  Print na

  NPrint "(",na-ona," bytes)"

  ona.l=na
Next a

MouseWait
End

[idrougge]

What does &array() point at? Some kind of arraybase?

[Cylon]

Originally Posted by idrougge

What does &array() point at? Some kind of arraybase?

Yes.

The address of an array something() is &something(0), the pointer to the first entry.

Just keep in mind, that an array is mostly a linear block of memory, the index of an item 1 or 10 is just an offset to the start address (multiplied with the size for each item).