Enum AttachmentKind

#[non_exhaustive]
pub enum AttachmentKind<'f> {
    Opaque(&'f (dyn Send + Sync + 'static)),
    Printable(&'f dyn Printable),
}

Classification of an attachment which is determined by the method it was created in.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Opaque(&'f (dyn Send + Sync + 'static))

A generic attachment created through attach().

Printable(&'f dyn Printable)

A printable attachment created through attach_printable().