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ea5f15deb0
NSArray *a= [NSArray arrayWithObjects: @"a", @"b", @"c", nil];
FOR_IN(NSString*, o, a)
NSLog(@"%@", o);
END_FOR_IN(a)
This is equivalent to:
for (NSString *o in a)
{
NSLog(@"%@", o);
}
On clang, it will be expanded to exactly that. With GCC, it will be expanded to something equivalent to the code that Clang (or Apple GCC) would expand this to.
This is a private GNUstep header and is not intended for general use. Outside of GNUstep, please use fast enumeration directly.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@29170 72102866-910b-0410-8b05-ffd578937521
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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#ifdef __clang__
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#define FOR_IN(type, var, collection) \
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for (type var in collection)
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#define END_FOR_IN(collection) }
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#else
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#define FOR_IN(type, var, c) \
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do\
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{\
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type var;\
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volatile NSFastEnumerationState gs_##c##_enumState = { 0 };\
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id gs_##c##_items[16];\
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unsigned long gs_##c##_limit = \
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[c countByEnumeratingWithState: &gs_##c##_enumState \
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objects: gs_##c##_items \
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count: 16];\
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if (gs_##c##_limit)\
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{\
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unsigned long gs_startMutations = *gs_##c##_enumState.mutationsPtr;\
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do {\
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unsigned long gs_##c##counter = 0;\
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do {\
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if (gs_startMutations != *gs_##c##_enumState.mutationsPtr)\
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{\
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objc_enumerationMutation(c);\
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}\
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var = gs_##c##_enumState.itemsPtr[gs_##c##counter++];\
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#define END_FOR_IN(c) \
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} while (gs_##c##counter < gs_##c##_limit);\
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} while (gs_##c##_limit = [c countByEnumeratingWithState: &gs_##c##_enumState\
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objects: gs_##c##_items\
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count: 16]);\
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}\
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} while(0);
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#endif
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