chaining.swift

func &<T>(x: T, op: T -> T) -> T {
    return op(x)
}

func &<T>(x: T, op: T -> ()) -> T {
    op(x)
    return x
}

attributes.transform3D = CATransform3DIdentity
                     & { CATransform3DRotate($0, rotation, 0, 1, 0) }
                     & { CATransform3DTranslate($0, 0, 0, translation) }
                     & { (var t) in t.m34 = -1.0 / 300 }


override func layoutAttributesForSupplementaryViewOfKind(elementKind: String!, atIndexPath indexPath: NSIndexPath!) -> UICollectionViewLayoutAttributes! {
    
    return UICollectionViewLayoutAttributes(forSupplementaryViewOfKind: elementKind, withIndexPath: indexPath)
       & { self.configureAttributes($0, at: indexPath) }
       & { $0.size = CGSize(width: self.columnWidth, height: self.columnWidth) }
    
}

override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath!) -> UICollectionViewLayoutAttributes! {
    
    return UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
       & { self.configureAttributes($0, at: indexPath) }
       & { $0.size = CGSize(width: self.columnWidth, height: self.collectionView.bounds.height) }
}