# CFBinaryHeapCreate(_:_:_:_:) Creates a new mutable or fixed-mutable binary heap. ``` func CFBinaryHeapCreate(_ allocator: CFAllocator!, _ capacity: CFIndex, _ callBacks: UnsafePointer!, _ compareContext: UnsafePointer!) -> CFBinaryHeap! ``` ## Parameters `allocator` The allocator to use to allocate memory for the new object. Pass `NULL` or kCFAllocatorDefault to use the current default allocator. `capacity` The maximum number of values that can be contained by the binary heap. The binary heap starts empty and can grow to this number of values. If this parameter is `0`, the binary heap’s maximum capacity is limited only by memory. `callBacks` A pointer to a [`CFBinaryHeapCallBacks`](/documentation/CoreFoundation/CFBinaryHeapCallBacks) structure initialized with the callbacks that operate on the values placed into the binary heap. If the binary heap will be holding `CFString` objects, pass the [`kCFStringBinaryHeapCallBacks`](/documentation/CoreFoundation/kCFStringBinaryHeapCallBacks) constant. This functions makes a copy of the contents of the callbacks structure, so that a pointer to a structure on the stack can be passed in, or can be reused for multiple binary heap creations. This callbacks parameter may not be `NULL`. `compareContext` Not used. Pass `NULL`. ## Return Value A new `CFBinaryHeap` object. 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 --- 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)