#[non_exhaustive]
pub enum LabelingJobStatus {
Completed,
Failed,
InProgress,
Initializing,
Stopped,
Stopping,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against LabelingJobStatus
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let labelingjobstatus = unimplemented!();
match labelingjobstatus {
LabelingJobStatus::Completed => { /* ... */ },
LabelingJobStatus::Failed => { /* ... */ },
LabelingJobStatus::InProgress => { /* ... */ },
LabelingJobStatus::Initializing => { /* ... */ },
LabelingJobStatus::Stopped => { /* ... */ },
LabelingJobStatus::Stopping => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when labelingjobstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant LabelingJobStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
LabelingJobStatus::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant LabelingJobStatus::NewFeature
is defined.
Specifically, when labelingjobstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on LabelingJobStatus::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Completed
Failed
InProgress
Initializing
Stopped
Stopping
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for LabelingJobStatus
impl AsRef<str> for LabelingJobStatus
source§impl Clone for LabelingJobStatus
impl Clone for LabelingJobStatus
source§fn clone(&self) -> LabelingJobStatus
fn clone(&self) -> LabelingJobStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for LabelingJobStatus
impl Debug for LabelingJobStatus
source§impl From<&str> for LabelingJobStatus
impl From<&str> for LabelingJobStatus
source§impl FromStr for LabelingJobStatus
impl FromStr for LabelingJobStatus
source§impl Hash for LabelingJobStatus
impl Hash for LabelingJobStatus
source§impl Ord for LabelingJobStatus
impl Ord for LabelingJobStatus
source§fn cmp(&self, other: &LabelingJobStatus) -> Ordering
fn cmp(&self, other: &LabelingJobStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<LabelingJobStatus> for LabelingJobStatus
impl PartialEq<LabelingJobStatus> for LabelingJobStatus
source§fn eq(&self, other: &LabelingJobStatus) -> bool
fn eq(&self, other: &LabelingJobStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<LabelingJobStatus> for LabelingJobStatus
impl PartialOrd<LabelingJobStatus> for LabelingJobStatus
source§fn partial_cmp(&self, other: &LabelingJobStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &LabelingJobStatus) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for LabelingJobStatus
impl StructuralEq for LabelingJobStatus
impl StructuralPartialEq for LabelingJobStatus
Auto Trait Implementations§
impl RefUnwindSafe for LabelingJobStatus
impl Send for LabelingJobStatus
impl Sync for LabelingJobStatus
impl Unpin for LabelingJobStatus
impl UnwindSafe for LabelingJobStatus
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.