+- Forum (https://www.boriel.com/forum)
+-- Forum: Compilers and Computer Languages (https://www.boriel.com/forum/forumdisplay.php?fid=12)
+--- Forum: ZX Basic Compiler (https://www.boriel.com/forum/forumdisplay.php?fid=11)
+---- Forum: Wishlist (https://www.boriel.com/forum/forumdisplay.php?fid=14)
+---- Thread: CLEAR (/showthread.php?tid=2339)
CLEAR - zarsoft - 03-04-2023
How do I clean an ARRAY?
I would like to use the function CLEAR.
Code:
VAR A(3) TYPE INTEGER
PROCEDURE CLEAR (v)
FOR i = ADDRESS(v) TO ADDRESS(v)+SIZE(v)-1
POKE i,0
NEXT i
END PROCEDURE
PROCEDURE Clean
CLEAR A
END PROCEDURE
PROCEDURE Test
LET A(1) = 1
PRINT A(1)
Clean
PRINT A(1)
END PROCEDURERE: CLEAR - boriel - 03-06-2023
There is a faster way, use memset:
Code:
#include <memcopy.bas>
PROCEDURE CLEAR (v)
MEMCOPY(ADDRESS(v), 0, SIZE(v))
END PROCEDUREPlease, try this and tell me if it works.
Also, I'm curious: How did you implement ADDRESS(v) and SIZE(v), they can be useful and included in the compiler.
(The next version will have changes and will update the standard library).
RE: CLEAR - zarsoft - 03-06-2023
I have not implemented these functions.
I was hoping you had already implemented them.
RE: CLEAR - boriel - 03-06-2023
No. To get the address of an element, you normally use the @ operator.
I.e. @a returns the memory address (uInteger) of the [a] variable. For arrays, @arr won't work as expected as it will return the address of the array's metadata. To get the address of the 1st element you will use @arr(0, 0).
I will come back with a solution on the size, but it might be not that strightforward.
RE: CLEAR - zarsoft - 03-06-2023
CLEAR an array would be very useful.