---
title: "passUnretained(_:)"
framework: swift
role: symbol
role_heading: Type Method
path: "swift/unmanaged/passunretained(_:)"
---

# passUnretained(_:)

Creates an unmanaged reference without performing an unbalanced retain.

## Declaration

```swift
static func passUnretained(_ value: Instance) -> Unmanaged<Instance>
```

## Parameters

- `value`: A class instance.

## Return Value

Return Value An unmanaged reference to the object passed as value.

## Discussion

Discussion This is useful when passing a reference to an API which Swift does not know the ownership rules for, but you know that the API expects you to pass the object at +0. CFArraySetValueAtIndex(.passUnretained(array), i,                        .passUnretained(object))