# asUint64List method

Uint64List asUint64List ([int offsetInBytes = 0, int length ])

Creates a Uint64List view of a region of this byte buffer.

The view is backed by the bytes of this byte buffer. Any changes made to the `Uint64List` will also change the buffer, and vice versa.

The viewed region start at `offsetInBytes`, which must be 64-bit aligned, and contains `length` 64-bit integers. If `length` is omitted, the range extends as far towards the end of the buffer as possible - if lengthInBytes is not divisible by eight, the last bytes can't be part of the view.

The start index and length must describe a valid 64-bit aligned range of the buffer:

- `offsetInBytes` must not be negative,
- `offsetInBytes` must be divisible by eight,
- `length` must not be negative, and
- `offsetInBytes + length * 8` must not be greater than lengthInBytes.

## Implementation

    Uint64List asUint64List([int offsetInBytes = 0, int length]);