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