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