Quoting Kai-Uwe Behrmann <k...@gmx.de>:
> Am 13.02.2014 17:51, schrieb marti.ma...@littlecms.com:
>> Still, the issue continues to be in how to differentiate cmsContext
>> from user data. If we could fix that, then compatibility would
>> be kept.
>
> Just an idea:
Yep, that is how actually works, and this is the source of all pain.
What I really need is a sort function that given a pointer, would guess
if this points to a cmsContext internal structure or to used supplied
data. My first idea was to use a bit in the very upper part of the
pointer, but this is not portable and would need an integral type
wider than a pointer.
if (ptr & 0x100000000) {
Context = ptr & !0x100000000; // this is a context
usr = NULL;
}
else {
Context = NULL;
usr = ptr; // A user pointer.
}
I'm right now open to other ideas.
Regards
Marti
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