NSAttributeString source code....

[Lloyd Dupont]

In NSAttributedString I found the following code (snippets)
======= NSAttributedString.m (snippets) ==============

static SEL getSel;

@implementation NSAttributedString

+ (void) initialize
{
 if (self == [NSAttributedString class])
   {
     getSel = @selector(attributesAtIndex:effectiveRange:);
   }
}

- (NSDictionary*) attributesAtIndex: (unsigned int)index
      longestEffectiveRange: (NSRange*)aRange
      inRange: (NSRange)rangeLimit
{
 NSDictionary *attrDictionary;
 IMP  getImp;

 getImp = [self methodForSelector: getSel];
 attrDictionary = (*getImp)(self, getSel, index, aRange);
 return attrDictionary;
}
@end

===========================================

Now I wonder.....
Why in Hell write that?

I mean what's wrong with:
 attrDictionary = [self attributesAtIndex: index effectiveRange: aRange] 

Why replace it by:
 static SEL getSel;
 getSel = @selector(attributesAtIndex:effectiveRange:);
 getImp = [self methodForSelector: getSel];
 attrDictionary = (*getImp)(self, getSel, index, aRange);


Yes, why????
why GNUstep code work so hard at being so obscure???