Simple but usefull...

Charles
_______________________

\ R-ALLOC-N ( size n -- n*addr )
\ -------------------------------
\ Allocates a count of n*size byte on the return stack
\ and returns n consecutives addresses fields.

: make-fields ( size n addr -- n*addr' )
    swap 0 ?DO ( size addr) tuck over + LOOP 2drop ;

: R-ALLOC-N ( size n -- n*addr )
    postpone 2dup
    postpone *
    postpone r-alloc
    postpone make-fields ; immediate

\\ test

: rect. ( rect -- )
    @+ . @+ . @+ . ? ;
(
struct
    1 cell field rect.left
    1 cell field rect.top
    1 cell field rect.right
    1 cell field rect.bottom
end-struct RECT-STRUCT
)
4 cells constant RECT-SIZE

: test
    RECT-SIZE 3 r-alloc-n locals| rect3 rect2 rect1 |
    1 2 3 4 rect1 !rect
    5 6 7 8 rect2 !rect
    9 10 11 12 rect3 !rect
    rect1 rect.
    rect2 @rect rect1 !rect
    rect1 rect.
    rect3 @rect rect1 !rect
    rect1 rect. ;

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Received on Wed Nov 05 2003 - 06:10:33 PST