zero_type();

You' probably use an integer type to represent the objects, and then the code would be

#define pointer2object(p) ((unsigned long) (p) - 1) #define object2pointer(o) ((struct object *) ((o) + 1)

Should work fine on any traditional C implementation, I think. Could break a conservative garbage collector pretty hard, though.

Anyway I'd prefer to let the machine code generator handle it ;-)

/ Niels Möller (igelkottsräddare)

Previous text:

2003-09-29 21:21: Subject: zero_type();

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I see. And compilers won't flip out and do funny code from the necessary casts to offset a pointer like that?

foo = ((struct object *) ((char *) ptr - 1))->foo;

/ Martin Stjernholm, Roxen IS