# Managed Buffers Build your own buffer-backed collection types. ## Topics ### Buffer Implementation [`class ManagedBuffer`](/documentation/Swift/ManagedBuffer) A class whose instances contain a property of type `Header` and raw storage for an array of `Element`, whose size is determined at instance creation. [`struct ManagedBufferPointer`](/documentation/Swift/ManagedBufferPointer) Contains a buffer object, and provides access to an instance of `Header` and contiguous storage for an arbitrary number of `Element` instances stored in that buffer. ### Uniqueness Checking [`func isKnownUniquelyReferenced(inout T?) -> Bool`](/documentation/Swift/isKnownUniquelyReferenced(_:)-98zpp) Returns a Boolean value indicating whether the given object is known to have a single strong reference. [`func isKnownUniquelyReferenced(inout T) -> Bool`](/documentation/Swift/isKnownUniquelyReferenced(_:)-5kvtu) Returns a Boolean value indicating whether the given object is known to have a single strong reference. --- 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)