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