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