# init(type:length:_:) Create TLV with the specified sizes for the type and length fields. ``` init(type: T.Type, length: L.Type, @ProtocolStackBuilder _ builder: () -> BelowProtocol) where T : Sendable, T : UnsignedInteger, L : Sendable, L : UnsignedInteger, BelowProtocol : StreamProtocol ``` ## Parameters `type` The object type to use for the `type` field. `length` The object type to use for the `length` field. `builder` The protocol stack below TLV. --- 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)