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# RandomAccessCollection Implementations

## Topics

### Instance Properties

[`var endIndex: Int`](/documentation/CoreAudio/UnsafeMutableAudioBufferListPointer/endIndex)

The “past the end” position; always identical to `count`.

[`var startIndex: Int`](/documentation/CoreAudio/UnsafeMutableAudioBufferListPointer/startIndex)

Always zero, which is the index of the first `AudioBuffer`.

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