# CVAttachmentContainer Provides storage for buffer attachments independent of the buffer lifetime ``` @dynamicMemberLookup struct CVAttachmentContainer where Keys : CVAttachmentKeyDefinitions ``` ## Overview This object can be used to hold a copy of all buffer attachments. The attachment values can be accessed as properties of this object similar to [`CVAttachmentAccess`](/documentation/CoreVideo/CVAttachmentAccess). ## Topics ### Initializers [`init(propagated: [String : any CVAttachmentValueRepresentable], nonPropagated: [String : any CVAttachmentValueRepresentable])`](/documentation/CoreVideo/CVAttachmentContainer/init(propagated:nonPropagated:)) ### Instance Methods [`func attachedMode(of: KeyPath>) -> CVAttachmentMode?`](/documentation/CoreVideo/CVAttachmentContainer/attachedMode(of:)-4qvrl) Returns the propagation mode of a stored attachment you identify with a key path to a key definition, without retrieving the value. [`func attachedMode(of: KeyPath>) -> CVAttachmentMode?`](/documentation/CoreVideo/CVAttachmentContainer/attachedMode(of:)-7vger) Returns the propagation mode of a stored attachment you identify with a key path to a key definition that supplies a default, without retrieving it. [`func attachedMode(of: String) -> CVAttachmentMode?`](/documentation/CoreVideo/CVAttachmentContainer/attachedMode(of:)-p6ms) Returns the propagation mode of a stored attachment you identify by its raw key string, without retrieving the value. [`func removeAll()`](/documentation/CoreVideo/CVAttachmentContainer/removeAll()) Removes all attachments. [`func update(from: CVAttachmentContainer)`](/documentation/CoreVideo/CVAttachmentContainer/update(from:)) Updates propagated and non-propagated attachment values using the provided container. ### Subscripts [`subscript(String, as _: Value.Type) -> (value: Value, mode: CVAttachmentMode)?`](/documentation/CoreVideo/CVAttachmentContainer/subscript(_:as:)) Get or set attachment value associated with a string key [`subscript(dynamicMember _: KeyPath>) -> Value?`](/documentation/CoreVideo/CVAttachmentContainer/subscript(dynamicMember:)-3qlmo) Get or set attachment value as a property of this object. [`subscript(dynamicMember _: KeyPath>) -> Value`](/documentation/CoreVideo/CVAttachmentContainer/subscript(dynamicMember:)-8zxr1) Get or set attachment value as a property of this object with default value. [`subscript(dynamicMember _: KeyPath>) -> Value?`](/documentation/CoreVideo/CVAttachmentContainer/subscript(dynamicMember:)-fjtq) Get or set composite attachment value as a property of this object. ## Relationships ### Conforms To [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) --- 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)