# Memory Management Functions Perform low-level memory management tasks. ## Topics ### Core Foundation ARC Integration [`func CFBridgingRetain(Any?) -> CFTypeRef?`](/documentation/Foundation/CFBridgingRetain(_:)) Casts an Objective-C pointer to a Core Foundation pointer and also transfers ownership to the caller. [`static idCFBridgingRelease(CFTypeRef X);`](/documentation/Foundation/CFBridgingRelease) Moves a non-Objective-C pointer to Objective-C and also transfers ownership to ARC. ### Memory Management [`func NSAllocateMemoryPages(Int) -> UnsafeMutableRawPointer`](/documentation/Foundation/NSAllocateMemoryPages(_:)) Allocates a new block of memory. [`func NSCopyMemoryPages(UnsafeRawPointer, UnsafeMutableRawPointer, Int)`](/documentation/Foundation/NSCopyMemoryPages(_:_:_:)) Copies a block of memory. [`func NSDeallocateMemoryPages(UnsafeMutableRawPointer, Int)`](/documentation/Foundation/NSDeallocateMemoryPages(_:_:)) Deallocates the specified block of memory. [`func NSLogPageSize() -> Int`](/documentation/Foundation/NSLogPageSize()) Returns the binary log of the page size. [`func NSPageSize() -> Int`](/documentation/Foundation/NSPageSize()) Returns the number of bytes in a page. [`func NSRealMemoryAvailable() -> Int`](/documentation/Foundation/NSRealMemoryAvailable()) Returns information about the user’s system. [`func NSRoundDownToMultipleOfPageSize(Int) -> Int`](/documentation/Foundation/NSRoundDownToMultipleOfPageSize(_:)) Returns the specified number of bytes rounded down to a multiple of the page size. [`func NSRoundUpToMultipleOfPageSize(Int) -> Int`](/documentation/Foundation/NSRoundUpToMultipleOfPageSize(_:)) Returns the specified number of bytes rounded up to a multiple of the page size. --- 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)