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# privateFunctionDescriptors

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

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

## Discussion

You specify private functions to link separately from [`functionDescriptors`](/documentation/Metal/MTL4StaticLinkingDescriptor/functionDescriptors) because pipelines don’t export private functions as [`MTLFunctionHandle`](/documentation/Metal/MTLFunctionHandle) instances.

> Note: You can link private functions even when your ``doc://com.apple.metal/documentation/Metal/MTLDevice`` doesn’t support function pointers.

---

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