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On 22/10/2007 at 07:06, xxxxxxxx wrote:
User Information: Cinema 4D Version: 8.5 Platform: Windows ; Language(s) : C.O.F.F.E.E ;
--------- I want to check if specific fields in a three-dimensional array are already set (the third dimension has only two fields). Although the term
if(edges[minPoint][maxPoint][0] == NULL) edges[minPoint][maxPoint][0] = value; else edges[minPoint][maxPoint][1] = value;
seems to be valid, COFFEE treats 0 like NULL. Thus, if the field is filled with 0, the value gets overwritten.
How can i distinguish between 0 (zero) and NULL (emtpy field)?
Regards Christoph Lauterbach
On 22/10/2007 at 10:27, xxxxxxxx wrote:
COFFEE doesn't have pointers being typeless. NULL is usually 0 - historically it represents an invalid memory address 0x00000000F assigned to pointers (Assem/C/C++/Java/...). Go to this link for more info:
http://en.wikipedia.org/wiki/Null_(computer)
There is no way to distinguish between 0 and NULL. All variable settings boil to numbers anyway - including pointers.
Do elements in edges[][][] represent pointers to something or the actual something itself?
On 23/10/2007 at 01:11, xxxxxxxx wrote:
Thank you Robert. As far as I know, NULL is usually not 0 - while 0 is a value, NULL indicates a non-value.
Anyway, I solved it with
if(typeof(edges[minPoint][maxPoint][0]) == DT_NIL) [...]
The elements in edges[][][] represent point indices (thus integers).
Regards Christoph