---
title: "&+=(_:_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/simd4/&+=(_:_:)-149yb"
---

# &+=(_:_:)

Updates the left hand side with the wrapping sum of the two vectors.

## Declaration

```swift
static func &+= (a: inout SIMD4<Scalar>, b: SIMD4<Scalar>)
```