System/Library/PrivateFrameworks/DVTInstrumentsUtilities.framework

XRMutableIndexSet.h

NSObject
>
XRIndexSet

@interface XRMutableIndexSet : XRIndexSet

- (void)addIndex:(unsigned long long)a0;
- (id)copyWithZone:(struct _NSZone { } *)a0;
- (void)addIndexesInRange:(struct _XRIndexRange { unsigned long long x0; unsigned long long x1; })a0;

@end