#[non_exhaustive]pub enum ImageVersionStatus {
Created,
CreateFailed,
Creating,
DeleteFailed,
Deleting,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against ImageVersionStatus, 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 imageversionstatus = unimplemented!();
match imageversionstatus {
ImageVersionStatus::Created => { /* ... */ },
ImageVersionStatus::CreateFailed => { /* ... */ },
ImageVersionStatus::Creating => { /* ... */ },
ImageVersionStatus::DeleteFailed => { /* ... */ },
ImageVersionStatus::Deleting => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when imageversionstatus represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ImageVersionStatus::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
ImageVersionStatus::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 ImageVersionStatus::NewFeature is defined.
Specifically, when imageversionstatus represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on ImageVersionStatus::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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
Created
CreateFailed
Creating
DeleteFailed
Deleting
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 ImageVersionStatus
impl ImageVersionStatus
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 ImageVersionStatus
impl AsRef<str> for ImageVersionStatus
source§impl Clone for ImageVersionStatus
impl Clone for ImageVersionStatus
source§fn clone(&self) -> ImageVersionStatus
fn clone(&self) -> ImageVersionStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for ImageVersionStatus
impl Debug for ImageVersionStatus
source§impl Display for ImageVersionStatus
impl Display for ImageVersionStatus
source§impl From<&str> for ImageVersionStatus
impl From<&str> for ImageVersionStatus
source§impl FromStr for ImageVersionStatus
impl FromStr for ImageVersionStatus
source§impl Hash for ImageVersionStatus
impl Hash for ImageVersionStatus
source§impl Ord for ImageVersionStatus
impl Ord for ImageVersionStatus
source§fn cmp(&self, other: &ImageVersionStatus) -> Ordering
fn cmp(&self, other: &ImageVersionStatus) -> 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 ImageVersionStatus
impl PartialEq for ImageVersionStatus
source§impl PartialOrd for ImageVersionStatus
impl PartialOrd for ImageVersionStatus
impl Eq for ImageVersionStatus
impl StructuralPartialEq for ImageVersionStatus
Auto Trait Implementations§
impl Freeze for ImageVersionStatus
impl RefUnwindSafe for ImageVersionStatus
impl Send for ImageVersionStatus
impl Sync for ImageVersionStatus
impl Unpin for ImageVersionStatus
impl UnwindSafe for ImageVersionStatus
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§unsafe fn clone_to_uninit(&self, dst: *mut T)
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