#[non_exhaustive]pub enum DatasetStatus {
Active,
Creating,
Deleting,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DatasetStatus
, 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 datasetstatus = unimplemented!();
match datasetstatus {
DatasetStatus::Active => { /* ... */ },
DatasetStatus::Creating => { /* ... */ },
DatasetStatus::Deleting => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when datasetstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DatasetStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DatasetStatus::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 DatasetStatus::NewFeature
is defined.
Specifically, when datasetstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DatasetStatus::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 DatasetStatus
impl DatasetStatus
Source§impl DatasetStatus
impl DatasetStatus
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 DatasetStatus
impl AsRef<str> for DatasetStatus
Source§impl Clone for DatasetStatus
impl Clone for DatasetStatus
Source§fn clone(&self) -> DatasetStatus
fn clone(&self) -> DatasetStatus
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 DatasetStatus
impl Debug for DatasetStatus
Source§impl Display for DatasetStatus
impl Display for DatasetStatus
Source§impl From<&str> for DatasetStatus
impl From<&str> for DatasetStatus
Source§impl FromStr for DatasetStatus
impl FromStr for DatasetStatus
Source§impl Hash for DatasetStatus
impl Hash for DatasetStatus
Source§impl Ord for DatasetStatus
impl Ord for DatasetStatus
Source§fn cmp(&self, other: &DatasetStatus) -> Ordering
fn cmp(&self, other: &DatasetStatus) -> 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 DatasetStatus
impl PartialEq for DatasetStatus
Source§impl PartialOrd for DatasetStatus
impl PartialOrd for DatasetStatus
impl Eq for DatasetStatus
impl StructuralPartialEq for DatasetStatus
Auto Trait Implementations§
impl Freeze for DatasetStatus
impl RefUnwindSafe for DatasetStatus
impl Send for DatasetStatus
impl Sync for DatasetStatus
impl Unpin for DatasetStatus
impl UnwindSafe for DatasetStatus
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