---
title: release
framework: systemconfiguration
role: symbol
role_heading: Instance Property
path: systemconfiguration/scnetworkreachabilitycontext/release
---

# release

The callback used to remove a retain previously added for the info field. If this parameter is not a pointer to a function of the correct prototype, the behavior is undefined. The value can be NULL.

## Declaration

```swift
var release: ((UnsafeRawPointer) -> Void)?
```