CMAttachmentBearer
An object that can carry attachments.
Declaration
typealias CMAttachmentBearer = CFTypeRefDiscussion
A CMAttachmentBearer is a Core Foundation-based object that supports the suite of key/value/mode attachment APIs. Since “plain” C has no type subclassing, the framework uses CFType as the basis for the CMAttachmentBearer type. Not all CFTypes support CMAttachmentBearer methods, so if you call a CMAttachmentBearer method on a Core Foundation object that doesn’t support it, it fails.