I have a Obj-C method that is highly recursive, and needs to run at maximum
performance. With this in mind, I am locally caching the method's own IMP to
avoid the message dispatch for the recursive calls. It seems to work and gives
a measurable benefit, but I need to be absolutely certain it's right before
committing it to a release. Can anyone comment on whether it actually is right?
Have I missed anything? Anything even faster?
#define qUseImpCaching 1
- (void) recursivelySearchWithRect:(NSRect) rect index:(NSUInteger) indx
{
#if qUseImpCaching
static void(*sfunc)( id, SEL, NSRect, NSUInteger ) = nil;
if ( sfunc == nil )
sfunc = (void(*)( id, SEL, NSRect, NSUInteger ))[[self class]
instanceMethodForSelector:_cmd];
#endif
// other code omitted
// recurse:
#if qUseImpCaching
sfunc( self, _cmd, rect, subnode );
#else
[self recursivelySearchWithRect:rect index:subnode];
#endif
}
--Graham_______________________________________________
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