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