# subscript(_:) Reads or updates the pointee at the specified offset from this pointer. ``` subscript(i: Int) -> Pointee { get nonmutating set } ``` ## Parameters `i` The offset from this pointer at which to access an instance, measured in strides of the pointer’s `Pointee` type. ## Overview For a pointer `p`, the memory at `p + i` must be initialized when reading the value by using the subscript. When the subscript is used as the left side of an assignment, the memory at `p + i` is updated. The memory must be initialized or the pointer’s `Pointee` type must be a trivial type. Uninitialized memory cannot be initialized to a nontrivial type using this subscript. Instead, use an initializing method, such as `initialize(to:)`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)