#[non_exhaustive]pub enum AutoScalingConfigurationStatus {
Active,
Inactive,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against AutoScalingConfigurationStatus
, 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 autoscalingconfigurationstatus = unimplemented!();
match autoscalingconfigurationstatus {
AutoScalingConfigurationStatus::Active => { /* ... */ },
AutoScalingConfigurationStatus::Inactive => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when autoscalingconfigurationstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant AutoScalingConfigurationStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
AutoScalingConfigurationStatus::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 AutoScalingConfigurationStatus::NewFeature
is defined.
Specifically, when autoscalingconfigurationstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on AutoScalingConfigurationStatus::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
Inactive
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 AutoScalingConfigurationStatus
impl AutoScalingConfigurationStatus
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 AutoScalingConfigurationStatus
impl AsRef<str> for AutoScalingConfigurationStatus
source§impl Clone for AutoScalingConfigurationStatus
impl Clone for AutoScalingConfigurationStatus
source§fn clone(&self) -> AutoScalingConfigurationStatus
fn clone(&self) -> AutoScalingConfigurationStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl From<&str> for AutoScalingConfigurationStatus
impl From<&str> for AutoScalingConfigurationStatus
source§impl Ord for AutoScalingConfigurationStatus
impl Ord for AutoScalingConfigurationStatus
source§fn cmp(&self, other: &AutoScalingConfigurationStatus) -> Ordering
fn cmp(&self, other: &AutoScalingConfigurationStatus) -> 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 AutoScalingConfigurationStatus
impl PartialEq for AutoScalingConfigurationStatus
source§fn eq(&self, other: &AutoScalingConfigurationStatus) -> bool
fn eq(&self, other: &AutoScalingConfigurationStatus) -> bool
self
and other
values to be equal, and is used by ==
.source§impl PartialOrd for AutoScalingConfigurationStatus
impl PartialOrd for AutoScalingConfigurationStatus
impl Eq for AutoScalingConfigurationStatus
impl StructuralPartialEq for AutoScalingConfigurationStatus
Auto Trait Implementations§
impl Freeze for AutoScalingConfigurationStatus
impl RefUnwindSafe for AutoScalingConfigurationStatus
impl Send for AutoScalingConfigurationStatus
impl Sync for AutoScalingConfigurationStatus
impl Unpin for AutoScalingConfigurationStatus
impl UnwindSafe for AutoScalingConfigurationStatus
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more