# +=(_:_:) Modifies a column slice by adding each value in a collection to the corresponding element in the column. ``` static func += (lhs: inout ColumnSlice, rhs: C) where WrappedElement : AdditiveArithmetic, WrappedElement == C.Element, C : Collection ``` ## Parameters `lhs` A column. `rhs` A collection that contains elements of the same type as the column’s elements. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)