Int64List.view constructor Null safety

Int64List.view(
  1. ByteBuffer buffer,
  2. [int offsetInBytes = 0,
  3. int? length]
)

Creates an Int64List view of the specified region in buffer.

Changes in the Int64List will be visible in the byte buffer and vice versa. If the offsetInBytes index of the region is not specified, it defaults to zero (the first byte in the byte buffer). If the length is not specified, it defaults to null, which indicates that the view extends to the end of the byte buffer.

Throws RangeError if offsetInBytes or length are negative, or if offsetInBytes + (length * elementSizeInBytes) is greater than the length of buffer.

Throws ArgumentError if offsetInBytes is not a multiple of bytesPerElement.

Note that when creating a view from a TypedData list or byte data, that list or byte data may itself be a view on a larger buffer with a TypedData.offsetInBytes greater than zero. Merely doing Int64List.view(other.buffer, 0, count) may not point to the bytes you intended. Instead you may need to do:

Int64List.view(other.buffer, other.offsetInBytes, count)

Alternatively, use Int64List.sublistView which includes this computation:

Int64List.sublistView(other, 0, count);

(The third argument is an end index rather than a length, so if you start from a position greater than zero, you need not reduce the count correspondingly).

Implementation

factory Int64List.view(ByteBuffer buffer,
    [int offsetInBytes = 0, int? length]) {
  return buffer.asInt64List(offsetInBytes, length);
}