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