6 Dec
2007
6 Dec
'07
5:35 a.m.
Lars Luthman wrote:
That sounds OK. I suggest something like this:
struct URI_Mapper {
// call this with your URI and the host_data member - not RT safe
uint16_t (map_function*)(const char* uri, void* host_data);
// pass this as the second parameter to map_function()
void* host_data;
};
It doesn't provide a way for the host to say "I'm out of IDs!" though.
Will that be needed?
What about using int32_t and returning -1 as "out of IDs"? There's no
difference in CPU time spent anyway, because uint16_t is returned in the
same 32-bit register as int32_t is (eax, on x86).
Or you can use 0 (or 65535) for error. It doesn't look like something
that requires lots of thinking.
Also, a reverse mapping mechanism would be helpful at times (for
debugging/data monitors). I put it in my proposal for that specific
reason. It shouldn't be hard to implement, either (might be a waste of
memory, but of acceptable kind).
Or it might be a separate feature, so that certain people won't get too
confused ;)
Krzysztof