# CFHostCreateCopy(_:_:) Creates a new host object by copying. ``` func CFHostCreateCopy(_ alloc: CFAllocator?, _ host: CFHost) -> Unmanaged ``` ## Parameters `alloc` The allocator to use to allocate memory for the new object. Pass `NULL` or kCFAllocatorDefault to use the current default allocator. ## Return Value A valid CFHost object or `NULL` if the copy could not be created. The new host contains a copy of all previously resolved data from the original host. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029). ## Discussion This function is thread safe. --- 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)