---
title: copyDescription
framework: corefoundation
role: symbol
role_heading: Instance Property
path: corefoundation/cfrunloopsourcecontext/copydescription
---

# copyDescription

A copy description callback for your program-defined info pointer. Can be NULL.

## Declaration

```swift
var copyDescription: ((UnsafeRawPointer?) -> Unmanaged<CFString>?)!
```