Enum aws_sdk_m2::types::ApplicationLifecycle
source · #[non_exhaustive]pub enum ApplicationLifecycle {
Available,
Created,
Creating,
Deleting,
DeletingFromEnvironment,
Failed,
Ready,
Running,
Starting,
Stopped,
Stopping,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ApplicationLifecycle
, 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 applicationlifecycle = unimplemented!();
match applicationlifecycle {
ApplicationLifecycle::Available => { /* ... */ },
ApplicationLifecycle::Created => { /* ... */ },
ApplicationLifecycle::Creating => { /* ... */ },
ApplicationLifecycle::Deleting => { /* ... */ },
ApplicationLifecycle::DeletingFromEnvironment => { /* ... */ },
ApplicationLifecycle::Failed => { /* ... */ },
ApplicationLifecycle::Ready => { /* ... */ },
ApplicationLifecycle::Running => { /* ... */ },
ApplicationLifecycle::Starting => { /* ... */ },
ApplicationLifecycle::Stopped => { /* ... */ },
ApplicationLifecycle::Stopping => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when applicationlifecycle
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ApplicationLifecycle::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ApplicationLifecycle::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 ApplicationLifecycle::NewFeature
is defined.
Specifically, when applicationlifecycle
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ApplicationLifecycle::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
Available
Created
Creating
Deleting
DeletingFromEnvironment
Failed
Ready
Running
Starting
Stopped
Stopping
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 ApplicationLifecycle
impl ApplicationLifecycle
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 ApplicationLifecycle
impl AsRef<str> for ApplicationLifecycle
source§impl Clone for ApplicationLifecycle
impl Clone for ApplicationLifecycle
source§fn clone(&self) -> ApplicationLifecycle
fn clone(&self) -> ApplicationLifecycle
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ApplicationLifecycle
impl Debug for ApplicationLifecycle
source§impl Display for ApplicationLifecycle
impl Display for ApplicationLifecycle
source§impl From<&str> for ApplicationLifecycle
impl From<&str> for ApplicationLifecycle
source§impl FromStr for ApplicationLifecycle
impl FromStr for ApplicationLifecycle
source§impl Hash for ApplicationLifecycle
impl Hash for ApplicationLifecycle
source§impl Ord for ApplicationLifecycle
impl Ord for ApplicationLifecycle
source§fn cmp(&self, other: &ApplicationLifecycle) -> Ordering
fn cmp(&self, other: &ApplicationLifecycle) -> 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 ApplicationLifecycle
impl PartialEq for ApplicationLifecycle
source§fn eq(&self, other: &ApplicationLifecycle) -> bool
fn eq(&self, other: &ApplicationLifecycle) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ApplicationLifecycle
impl PartialOrd for ApplicationLifecycle
source§fn partial_cmp(&self, other: &ApplicationLifecycle) -> Option<Ordering>
fn partial_cmp(&self, other: &ApplicationLifecycle) -> 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 ApplicationLifecycle
impl StructuralPartialEq for ApplicationLifecycle
Auto Trait Implementations§
impl Freeze for ApplicationLifecycle
impl RefUnwindSafe for ApplicationLifecycle
impl Send for ApplicationLifecycle
impl Sync for ApplicationLifecycle
impl Unpin for ApplicationLifecycle
impl UnwindSafe for ApplicationLifecycle
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