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