#[non_exhaustive]pub enum LambdaSavingsEstimationModeSource {
CostExplorerRightsizing,
CostOptimizationHub,
PublicPricing,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against LambdaSavingsEstimationModeSource
, 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 lambdasavingsestimationmodesource = unimplemented!();
match lambdasavingsestimationmodesource {
LambdaSavingsEstimationModeSource::CostExplorerRightsizing => { /* ... */ },
LambdaSavingsEstimationModeSource::CostOptimizationHub => { /* ... */ },
LambdaSavingsEstimationModeSource::PublicPricing => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when lambdasavingsestimationmodesource
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant LambdaSavingsEstimationModeSource::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
LambdaSavingsEstimationModeSource::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 LambdaSavingsEstimationModeSource::NewFeature
is defined.
Specifically, when lambdasavingsestimationmodesource
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on LambdaSavingsEstimationModeSource::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
CostExplorerRightsizing
CostOptimizationHub
PublicPricing
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 LambdaSavingsEstimationModeSource
impl LambdaSavingsEstimationModeSource
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 LambdaSavingsEstimationModeSource
impl AsRef<str> for LambdaSavingsEstimationModeSource
source§impl Clone for LambdaSavingsEstimationModeSource
impl Clone for LambdaSavingsEstimationModeSource
source§fn clone(&self) -> LambdaSavingsEstimationModeSource
fn clone(&self) -> LambdaSavingsEstimationModeSource
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 LambdaSavingsEstimationModeSource
impl From<&str> for LambdaSavingsEstimationModeSource
source§impl Ord for LambdaSavingsEstimationModeSource
impl Ord for LambdaSavingsEstimationModeSource
source§fn cmp(&self, other: &LambdaSavingsEstimationModeSource) -> Ordering
fn cmp(&self, other: &LambdaSavingsEstimationModeSource) -> 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 LambdaSavingsEstimationModeSource
impl PartialEq for LambdaSavingsEstimationModeSource
source§fn eq(&self, other: &LambdaSavingsEstimationModeSource) -> bool
fn eq(&self, other: &LambdaSavingsEstimationModeSource) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for LambdaSavingsEstimationModeSource
impl PartialOrd for LambdaSavingsEstimationModeSource
source§fn partial_cmp(
&self,
other: &LambdaSavingsEstimationModeSource
) -> Option<Ordering>
fn partial_cmp( &self, other: &LambdaSavingsEstimationModeSource ) -> 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 LambdaSavingsEstimationModeSource
impl StructuralEq for LambdaSavingsEstimationModeSource
impl StructuralPartialEq for LambdaSavingsEstimationModeSource
Auto Trait Implementations§
impl RefUnwindSafe for LambdaSavingsEstimationModeSource
impl Send for LambdaSavingsEstimationModeSource
impl Sync for LambdaSavingsEstimationModeSource
impl Unpin for LambdaSavingsEstimationModeSource
impl UnwindSafe for LambdaSavingsEstimationModeSource
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
§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.