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