---
title: retain
framework: coreservices
role: symbol
role_heading: Instance Property
path: coreservices/aeremoteprocessresolvercontext/1450097-retain
---

# retain

A prototype for a function callback that retainsthe specified data. Called on the info pointer. This field may be NULL.

## Declaration

```swift
var retain: CFAllocatorRetainCallBack!
```