On 06.08.2007, at 00:37, Vincent Geddes wrote:
I am experimenting with Objective-C, and I am trying to create some
custom string classes.
The problem is that the gcc '-fconstant-string-class' option only
seems to allow custom classes which subclass `Object' (in the GNU
runtime).
Thats definitely wrong, the class doesn't matter (in both, gstep-base
and libFoundation NSConstantString inherits from NSObject, not Object).
The thing which _is_ required (for rather obvious reasons?) is the
constant ivar layout, which is
- Class isa;
- uchar *; // string
- uint; // length
gcc keeps on giving me the error `interface 'GooConstantString'
does not have valid constant string layout' if I subclass anything
other than `Object'.
Well, its because the ivar layout doesn't match the required constant
one?!
Interfaces:
@interface GooObject
...
@end
@interface GooString : GooObject
...
@end
@interface GooConstantString : GooString
{
Class isa;
char *c_string;
unsigned int len;
}
@end
Well, you don't give the ivar layout of your hierarchy (...?). Eg
that GooConstantString has an 'isa' ivar looks utterly wrong given
that any object needs to have an isa pointer (=> it has to be in your
root class). Maybe removing the 'isa' does the trick?
Greets,
Helge
--
Helge Hess
http://www.helgehess.eu/
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