static const NSArray< id< NSObject> > **controllers = nil;

NSArray< id< BlockController> > *someMethod();

@interface Fraction : NSObject
void Compute(
    Image< E::Matrix<SType, Dim,1> > const& src,
    Image<E::Matrix<TType,Dim,1> >& dst);
@end
@implementation SomeClass
- (void)initializeControllers:( NSArray< id< BlockController> > *)hybridContollers {
    if (index < children.count) {
        const unsigned int wl = w>>lvl;

        assert(x<0 && y>=3);
assert(y <0&&z> 2);
assert(a>>1);
assert(b >>1);

    return static_cast< id <CKMountable>>(children[index]);
  }

NSArray<id< BlockController> > *controllers = hybridContollers;
}
@end
