# GetOffset Returns the offset from the original start of the memory block. ``` uint64_t GetOffset(); ``` ## Return Value The number of bytes from the start of the original block of memory to the first byte of this memory map object. ## Discussion When creating a memory map object, you can map to a location in the middle of the underlying buffer. You might do this to access a specific structure inside that buffer. This method returns the offset from the original start of the buffer to the first byte of your mapping. --- 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)