# moveInitialize(from:count:) Moves instances from initialized source memory into the uninitialized memory referenced by this pointer, leaving the source memory uninitialized and the memory referenced by this pointer initialized. ``` func moveInitialize(from source: UnsafeMutablePointer, count: Int) ``` ## Parameters `source` A pointer to the values to copy. The memory region `source..<(source + count)` must be initialized. The memory regions referenced by `source` and this pointer may overlap. `count` The number of instances to move from `source` to this pointer’s memory. `count` must not be negative. ## Discussion The region of memory starting at this pointer and covering `count` instances of the pointer’s `Pointee` type must be uninitialized or `Pointee` must be a trivial type. After calling `moveInitialize(from:count:)`, the region is initialized and the memory region `source..<(source + count)` is uninitialized. > Note: Returns without performing work if `self` and `source` are equal. --- 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)