#[non_exhaustive]pub enum DatastoreStatus {
Active,
Creating,
Deleting,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DatastoreStatus
, 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 datastorestatus = unimplemented!();
match datastorestatus {
DatastoreStatus::Active => { /* ... */ },
DatastoreStatus::Creating => { /* ... */ },
DatastoreStatus::Deleting => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when datastorestatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DatastoreStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DatastoreStatus::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 DatastoreStatus::NewFeature
is defined.
Specifically, when datastorestatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DatastoreStatus::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
Active
Creating
Deleting
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
Source§impl DatastoreStatus
impl DatastoreStatus
Sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
Source§impl AsRef<str> for DatastoreStatus
impl AsRef<str> for DatastoreStatus
Source§impl Clone for DatastoreStatus
impl Clone for DatastoreStatus
Source§fn clone(&self) -> DatastoreStatus
fn clone(&self) -> DatastoreStatus
1.0.0 · Source§const fn clone_from(&mut self, source: &Self)
const fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for DatastoreStatus
impl Debug for DatastoreStatus
Source§impl Display for DatastoreStatus
impl Display for DatastoreStatus
Source§impl From<&str> for DatastoreStatus
impl From<&str> for DatastoreStatus
Source§impl FromStr for DatastoreStatus
impl FromStr for DatastoreStatus
Source§impl Hash for DatastoreStatus
impl Hash for DatastoreStatus
Source§impl Ord for DatastoreStatus
impl Ord for DatastoreStatus
Source§fn cmp(&self, other: &DatastoreStatus) -> Ordering
fn cmp(&self, other: &DatastoreStatus) -> Ordering
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl PartialEq for DatastoreStatus
impl PartialEq for DatastoreStatus
Source§impl PartialOrd for DatastoreStatus
impl PartialOrd for DatastoreStatus
impl Eq for DatastoreStatus
impl StructuralPartialEq for DatastoreStatus
Auto Trait Implementations§
impl Freeze for DatastoreStatus
impl RefUnwindSafe for DatastoreStatus
impl Send for DatastoreStatus
impl Sync for DatastoreStatus
impl Unpin for DatastoreStatus
impl UnwindSafe for DatastoreStatus
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