---
title: OSLMarkUPP
framework: coreservices
role: symbol
role_heading: Type Alias
path: coreservices/oslmarkupp
---

# OSLMarkUPP

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

## Declaration

```swift
typealias OSLMarkUPP = OSLMarkProcPtr
```

## Discussion

Discussion For a description of a mark callback function, see OSLMarkProcPtr.