---
title: "*=(_:_:)"
framework: simd
role: symbol
role_heading: Operator
path: "simd/simd_quatd/*=(_:_:)-9rhrs"
---

# *=(_:_:)

Multiplies two quaternions and stores the result in the left-hand-side variable.

## Declaration

```swift
static func *= (lhs: inout simd_quatd, rhs: simd_quatd)
```

## Discussion

Discussion The function returns the left-hand side quaternion rotated by the right-hand side quaternion.