---
title: OSLCompareUPP
framework: coreservices
role: symbol
role_heading: Type Alias
path: coreservices/oslcompareupp
---

# OSLCompareUPP

Defines a data type for the universal procedure pointer for the OSLCompareProcPtr callback function pointer.

## Declaration

```swift
typealias OSLCompareUPP = OSLCompareProcPtr
```

## Discussion

Discussion For a description of a compare callback function, see OSLCompareProcPtr.