#[non_exhaustive]pub enum ServiceNamespace {
Show 15 variants
Appstream,
Cassandra,
Comprehend,
CustomResource,
Dynamodb,
Ec2,
Ecs,
Elasticache,
Emr,
Kafka,
Lambda,
Neptune,
Rds,
Sagemaker,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ServiceNamespace
, 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 servicenamespace = unimplemented!();
match servicenamespace {
ServiceNamespace::Appstream => { /* ... */ },
ServiceNamespace::Cassandra => { /* ... */ },
ServiceNamespace::Comprehend => { /* ... */ },
ServiceNamespace::CustomResource => { /* ... */ },
ServiceNamespace::Dynamodb => { /* ... */ },
ServiceNamespace::Ec2 => { /* ... */ },
ServiceNamespace::Ecs => { /* ... */ },
ServiceNamespace::Elasticache => { /* ... */ },
ServiceNamespace::Emr => { /* ... */ },
ServiceNamespace::Kafka => { /* ... */ },
ServiceNamespace::Lambda => { /* ... */ },
ServiceNamespace::Neptune => { /* ... */ },
ServiceNamespace::Rds => { /* ... */ },
ServiceNamespace::Sagemaker => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when servicenamespace
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ServiceNamespace::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ServiceNamespace::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 ServiceNamespace::NewFeature
is defined.
Specifically, when servicenamespace
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ServiceNamespace::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
Appstream
Cassandra
Comprehend
CustomResource
Dynamodb
Ec2
Ecs
Elasticache
Emr
Kafka
Lambda
Neptune
Rds
Sagemaker
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 ServiceNamespace
impl ServiceNamespace
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 ServiceNamespace
impl AsRef<str> for ServiceNamespace
source§impl Clone for ServiceNamespace
impl Clone for ServiceNamespace
source§fn clone(&self) -> ServiceNamespace
fn clone(&self) -> ServiceNamespace
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ServiceNamespace
impl Debug for ServiceNamespace
source§impl Display for ServiceNamespace
impl Display for ServiceNamespace
source§impl From<&str> for ServiceNamespace
impl From<&str> for ServiceNamespace
source§impl FromStr for ServiceNamespace
impl FromStr for ServiceNamespace
source§impl Hash for ServiceNamespace
impl Hash for ServiceNamespace
source§impl Ord for ServiceNamespace
impl Ord for ServiceNamespace
source§fn cmp(&self, other: &ServiceNamespace) -> Ordering
fn cmp(&self, other: &ServiceNamespace) -> 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 ServiceNamespace
impl PartialEq for ServiceNamespace
source§fn eq(&self, other: &ServiceNamespace) -> bool
fn eq(&self, other: &ServiceNamespace) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ServiceNamespace
impl PartialOrd for ServiceNamespace
source§fn partial_cmp(&self, other: &ServiceNamespace) -> Option<Ordering>
fn partial_cmp(&self, other: &ServiceNamespace) -> 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 ServiceNamespace
impl StructuralPartialEq for ServiceNamespace
Auto Trait Implementations§
impl Freeze for ServiceNamespace
impl RefUnwindSafe for ServiceNamespace
impl Send for ServiceNamespace
impl Sync for ServiceNamespace
impl Unpin for ServiceNamespace
impl UnwindSafe for ServiceNamespace
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