#[non_exhaustive]pub enum TargetDestination {
Show 15 variants
AwsElasticBeanstalk,
AwsFargate,
AmazonDocumentdb,
AmazonDynamodb,
AmazonElasticCloudCompute,
AmazonElasticContainerService,
AmazonElasticKubernetesService,
AmazonRds,
AmazonRdsMysql,
AmazonRdsPostgresql,
AuroraMysql,
AuroraPostgresql,
BabelfishAuroraPostgresql,
NoneSpecified,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TargetDestination
, 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 targetdestination = unimplemented!();
match targetdestination {
TargetDestination::AwsElasticBeanstalk => { /* ... */ },
TargetDestination::AwsFargate => { /* ... */ },
TargetDestination::AmazonDocumentdb => { /* ... */ },
TargetDestination::AmazonDynamodb => { /* ... */ },
TargetDestination::AmazonElasticCloudCompute => { /* ... */ },
TargetDestination::AmazonElasticContainerService => { /* ... */ },
TargetDestination::AmazonElasticKubernetesService => { /* ... */ },
TargetDestination::AmazonRds => { /* ... */ },
TargetDestination::AmazonRdsMysql => { /* ... */ },
TargetDestination::AmazonRdsPostgresql => { /* ... */ },
TargetDestination::AuroraMysql => { /* ... */ },
TargetDestination::AuroraPostgresql => { /* ... */ },
TargetDestination::BabelfishAuroraPostgresql => { /* ... */ },
TargetDestination::NoneSpecified => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when targetdestination
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TargetDestination::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TargetDestination::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 TargetDestination::NewFeature
is defined.
Specifically, when targetdestination
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TargetDestination::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
AwsElasticBeanstalk
AwsFargate
AmazonDocumentdb
AmazonDynamodb
AmazonElasticCloudCompute
AmazonElasticContainerService
AmazonElasticKubernetesService
AmazonRds
AmazonRdsMysql
AmazonRdsPostgresql
AuroraMysql
AuroraPostgresql
BabelfishAuroraPostgresql
NoneSpecified
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 TargetDestination
impl TargetDestination
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 TargetDestination
impl AsRef<str> for TargetDestination
source§impl Clone for TargetDestination
impl Clone for TargetDestination
source§fn clone(&self) -> TargetDestination
fn clone(&self) -> TargetDestination
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TargetDestination
impl Debug for TargetDestination
source§impl Display for TargetDestination
impl Display for TargetDestination
source§impl From<&str> for TargetDestination
impl From<&str> for TargetDestination
source§impl FromStr for TargetDestination
impl FromStr for TargetDestination
source§impl Hash for TargetDestination
impl Hash for TargetDestination
source§impl Ord for TargetDestination
impl Ord for TargetDestination
source§fn cmp(&self, other: &TargetDestination) -> Ordering
fn cmp(&self, other: &TargetDestination) -> 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 TargetDestination
impl PartialEq for TargetDestination
source§fn eq(&self, other: &TargetDestination) -> bool
fn eq(&self, other: &TargetDestination) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for TargetDestination
impl PartialOrd for TargetDestination
source§fn partial_cmp(&self, other: &TargetDestination) -> Option<Ordering>
fn partial_cmp(&self, other: &TargetDestination) -> 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 TargetDestination
impl StructuralPartialEq for TargetDestination
Auto Trait Implementations§
impl Freeze for TargetDestination
impl RefUnwindSafe for TargetDestination
impl Send for TargetDestination
impl Sync for TargetDestination
impl Unpin for TargetDestination
impl UnwindSafe for TargetDestination
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