pub enum Presence {
Required,
Disallowed,
Optional,
}
Variants§
Required
The result of the +
operator
Disallowed
The result of the -
operator
Optional
The default case
Auto Trait Implementations§
impl RefUnwindSafe for Presence
impl Send for Presence
impl Sync for Presence
impl Unpin for Presence
impl UnwindSafe for Presence
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more