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