---
title: "&+=(_:_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/simd64/&+=(_:_:)-1m6vg"
---

# &+=(_:_:)

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

## Declaration

```swift
static func &+= (a: inout SIMD64<Scalar>, b: SIMD64<Scalar>)
```