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# MTLFunctionStitchingFunctionNode

A call graph node that describes a function call and its inputs.

```
class MTLFunctionStitchingFunctionNode
```

## Overview

When the Metal device object evaluates the function graph to compile the stitched function, it evaluates the nodes stored in the [`arguments`](/documentation/Metal/MTLFunctionStitchingFunctionNode/arguments) property that it hasn’t already evaluated, and then calls the function specified by [`name`](/documentation/Metal/MTLFunctionStitchingFunctionNode/name) to generate the node’s output.

If the function has side effects on the input data, use the [`controlDependencies`](/documentation/Metal/MTLFunctionStitchingFunctionNode/controlDependencies) property on other nodes to specify whether the Metal device object needs to evaluate this node first.

## Topics

### Initializing a function node

[`init(name:arguments:controlDependencies:)`](/documentation/Metal/MTLFunctionStitchingFunctionNode/init(name:arguments:controlDependencies:))

Creates a new function node.

### Configuring a function node

[`name`](/documentation/Metal/MTLFunctionStitchingFunctionNode/name)

The name of the function to call.

[`arguments`](/documentation/Metal/MTLFunctionStitchingFunctionNode/arguments)

An ordered list of the nodes that provide the function’s arguments.

[`controlDependencies`](/documentation/Metal/MTLFunctionStitchingFunctionNode/controlDependencies)

The list of nodes that need to execute before executing the node.


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