---
title: "copyCommands(sourceBuffer:sourceRange:destinationBuffer:destinationIndex:)"
framework: metal
role: symbol
role_heading: Instance Method
path: "metal/mtl4computecommandencoder/copycommands(sourcebuffer:sourcerange:destinationbuffer:destinationindex:)"
---

# copyCommands(sourceBuffer:sourceRange:destinationBuffer:destinationIndex:)

Encodes a command that copies commands from one indirect command buffer into another.

## Declaration

```swift
func copyCommands(sourceBuffer: any MTLIndirectCommandBuffer, sourceRange: Range<Int>, destinationBuffer: any MTLIndirectCommandBuffer, destinationIndex: Int)
```

## Parameters

- `sourceRange`: The range of commands in sourceBuffer to copy. The copy operation requires that the source range starts at a valid execution point.
- `destinationIndex`: An index in destinationBuffer into where the command copies content to. The copy operation requires that the destination index is a valid execution point with enough space left in destinationBuffer to accommodate sourceRange.count commands.