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

# copyDescription

The callback used to create a descriptive string representation of each value in the collection. If NULL, the collection will create a simple description of each value. See CFSetCopyDescriptionCallBack for a description of this callback.

## Declaration

```swift
var copyDescription: CFSetCopyDescriptionCallBack!
```