#[non_exhaustive]pub enum RecommendationSourceType {
AutoScalingGroup,
EbsVolume,
Ec2Instance,
EcsService,
LambdaFunction,
License,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against RecommendationSourceType
, 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 recommendationsourcetype = unimplemented!();
match recommendationsourcetype {
RecommendationSourceType::AutoScalingGroup => { /* ... */ },
RecommendationSourceType::EbsVolume => { /* ... */ },
RecommendationSourceType::Ec2Instance => { /* ... */ },
RecommendationSourceType::EcsService => { /* ... */ },
RecommendationSourceType::LambdaFunction => { /* ... */ },
RecommendationSourceType::License => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when recommendationsourcetype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant RecommendationSourceType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
RecommendationSourceType::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 RecommendationSourceType::NewFeature
is defined.
Specifically, when recommendationsourcetype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on RecommendationSourceType::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
AutoScalingGroup
EbsVolume
Ec2Instance
EcsService
LambdaFunction
License
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 RecommendationSourceType
impl RecommendationSourceType
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 RecommendationSourceType
impl AsRef<str> for RecommendationSourceType
source§impl Clone for RecommendationSourceType
impl Clone for RecommendationSourceType
source§fn clone(&self) -> RecommendationSourceType
fn clone(&self) -> RecommendationSourceType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for RecommendationSourceType
impl Debug for RecommendationSourceType
source§impl Display for RecommendationSourceType
impl Display for RecommendationSourceType
source§impl From<&str> for RecommendationSourceType
impl From<&str> for RecommendationSourceType
source§impl FromStr for RecommendationSourceType
impl FromStr for RecommendationSourceType
source§impl Hash for RecommendationSourceType
impl Hash for RecommendationSourceType
source§impl Ord for RecommendationSourceType
impl Ord for RecommendationSourceType
source§fn cmp(&self, other: &RecommendationSourceType) -> Ordering
fn cmp(&self, other: &RecommendationSourceType) -> 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 RecommendationSourceType
impl PartialEq for RecommendationSourceType
source§fn eq(&self, other: &RecommendationSourceType) -> bool
fn eq(&self, other: &RecommendationSourceType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for RecommendationSourceType
impl PartialOrd for RecommendationSourceType
source§fn partial_cmp(&self, other: &RecommendationSourceType) -> Option<Ordering>
fn partial_cmp(&self, other: &RecommendationSourceType) -> 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 RecommendationSourceType
impl StructuralPartialEq for RecommendationSourceType
Auto Trait Implementations§
impl Freeze for RecommendationSourceType
impl RefUnwindSafe for RecommendationSourceType
impl Send for RecommendationSourceType
impl Sync for RecommendationSourceType
impl Unpin for RecommendationSourceType
impl UnwindSafe for RecommendationSourceType
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