---
title: "+(_:_:)"
framework: simd
role: symbol
role_heading: Operator
path: "simd/simd_double3x3/+(_:_:)"
---

# +(_:_:)

## Declaration

```swift
static func + (lhs: simd_double3x3, rhs: simd_double3x3) -> simd_double3x3
```