pub enum MaybeUnset<V> where
V: Value, {
Unset,
Set(V),
}
Expand description
Enum providing a way to represent a value that might be unset
Variants
Unset
Set(V)
Trait Implementations
sourceimpl<V> Clone for MaybeUnset<V> where
V: Clone + Value,
impl<V> Clone for MaybeUnset<V> where
V: Clone + Value,
sourcefn clone(&self) -> MaybeUnset<V>
fn clone(&self) -> MaybeUnset<V>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl<V> Value for MaybeUnset<V> where
V: Value,
impl<V> Value for MaybeUnset<V> where
V: Value,
impl<V> Copy for MaybeUnset<V> where
V: Copy + Value,
Auto Trait Implementations
impl<V> RefUnwindSafe for MaybeUnset<V> where
V: RefUnwindSafe,
impl<V> Send for MaybeUnset<V> where
V: Send,
impl<V> Sync for MaybeUnset<V> where
V: Sync,
impl<V> Unpin for MaybeUnset<V> where
V: Unpin,
impl<V> UnwindSafe for MaybeUnset<V> where
V: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
fn vzip(self) -> V
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more