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

# copyDescription

A prototype for a function callback that provides a description of the data pointed to by the info field. In implementing this function, return a reference to a CFString object that describes your allocator, particularly some characteristics of your program-defined data. You may set this function pointer to NULL, in which case Core Foundation will provide a rudimentary description.

## Declaration

```swift
var copyDescription: CFAllocatorCopyDescriptionCallBack!
```