#[non_exhaustive]
pub enum TrainingJobStatus {
Completed,
Failed,
InProgress,
Stopped,
Stopping,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TrainingJobStatus
, 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 trainingjobstatus = unimplemented!();
match trainingjobstatus {
TrainingJobStatus::Completed => { /* ... */ },
TrainingJobStatus::Failed => { /* ... */ },
TrainingJobStatus::InProgress => { /* ... */ },
TrainingJobStatus::Stopped => { /* ... */ },
TrainingJobStatus::Stopping => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when trainingjobstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TrainingJobStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TrainingJobStatus::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 TrainingJobStatus::NewFeature
is defined.
Specifically, when trainingjobstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TrainingJobStatus::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
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 TrainingJobStatus
impl AsRef<str> for TrainingJobStatus
source§impl Clone for TrainingJobStatus
impl Clone for TrainingJobStatus
source§fn clone(&self) -> TrainingJobStatus
fn clone(&self) -> TrainingJobStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TrainingJobStatus
impl Debug for TrainingJobStatus
source§impl From<&str> for TrainingJobStatus
impl From<&str> for TrainingJobStatus
source§impl FromStr for TrainingJobStatus
impl FromStr for TrainingJobStatus
source§impl Hash for TrainingJobStatus
impl Hash for TrainingJobStatus
source§impl Ord for TrainingJobStatus
impl Ord for TrainingJobStatus
source§fn cmp(&self, other: &TrainingJobStatus) -> Ordering
fn cmp(&self, other: &TrainingJobStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<TrainingJobStatus> for TrainingJobStatus
impl PartialEq<TrainingJobStatus> for TrainingJobStatus
source§fn eq(&self, other: &TrainingJobStatus) -> bool
fn eq(&self, other: &TrainingJobStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<TrainingJobStatus> for TrainingJobStatus
impl PartialOrd<TrainingJobStatus> for TrainingJobStatus
source§fn partial_cmp(&self, other: &TrainingJobStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &TrainingJobStatus) -> 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 TrainingJobStatus
impl StructuralEq for TrainingJobStatus
impl StructuralPartialEq for TrainingJobStatus
Auto Trait Implementations§
impl RefUnwindSafe for TrainingJobStatus
impl Send for TrainingJobStatus
impl Sync for TrainingJobStatus
impl Unpin for TrainingJobStatus
impl UnwindSafe for TrainingJobStatus
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.