operator  method
Load a Dart value from this location offset by
Pointer is unboxed before being stored (as if by
.address), and the
pointer is boxed (as if by
Pointer.fromAddress) when loaded.
On 32-bit platforms the
address must be 4-byte aligned, and on 64-bit
address must be 8-byte aligned.
external Pointer<T> operator (int index);