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