---
title: privateFunctionDescriptors
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4staticlinkingdescriptor/privatefunctiondescriptors
---

# privateFunctionDescriptors

Provides an array of private functions to link at the Metal IR level.

## Declaration

```swift
var privateFunctionDescriptors: [MTL4FunctionDescriptor]? { get set }
```

## Discussion

Discussion You specify private functions to link separately from functionDescriptors because pipelines don’t export private functions as MTLFunctionHandle instances. note: You can link private functions even when your MTLDevice doesn’t support function pointers.