---
title: CMFlattenUPP
framework: applicationservices
role: symbol
role_heading: Type Alias
path: applicationservices/cmflattenupp
---

# CMFlattenUPP

Defines a universal procedure pointer to a data-flattening callback.

## Declaration

```swift
typealias CMFlattenUPP = CMFlattenProcPtr
```

## Discussion

Discussion For more information, see the description of the CMFlattenProcPtr callback function.