Int64List.sublistView constructor
- @Since("2.8")
Creates an Int64List view on a range of elements of data.
Creates a view on the range of data.buffer which corresponds
to the elements of data from start until end.
If data is a typed data list, like Uint16List, then the view is on
the bytes of the elements with indices from start until end.
If data is a ByteData, it's treated like a list of bytes.
If provided, start and end must satisfy
0 ≤ start ≤ end ≤ elementCount
where elementCount is the number of elements in data, which
is the same as the List.length of a typed data list.
If omitted, start defaults to zero and end to elementCount.
The start and end indices of the range of bytes being viewed must be multiples of eight.
Implementation
@Since("2.8")
factory Int64List.sublistView(TypedData data, [int start = 0, int end]) {
int elementSize = data.elementSizeInBytes;
end = RangeError.checkValidRange(
start, end, data.lengthInBytes ~/ elementSize);
int byteLength = (end - start) * elementSize;
if (byteLength % bytesPerElement != 0) {
throw ArgumentError("The number of bytes to view must be a multiple of " +
"$bytesPerElement");
}
return data.buffer.asInt64List(data.offsetInBytes + start * elementSize,
byteLength ~/ bytesPerElement);
}