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