Enum aws_sdk_kinesis::model::ScalingType
source · #[non_exhaustive]
pub enum ScalingType {
UniformScaling,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ScalingType
, 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 scalingtype = unimplemented!();
match scalingtype {
ScalingType::UniformScaling => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when scalingtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ScalingType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ScalingType::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 ScalingType::NewFeature
is defined.
Specifically, when scalingtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ScalingType::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
UniformScaling
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for ScalingType
impl AsRef<str> for ScalingType
source§impl Clone for ScalingType
impl Clone for ScalingType
source§fn clone(&self) -> ScalingType
fn clone(&self) -> ScalingType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ScalingType
impl Debug for ScalingType
source§impl From<&str> for ScalingType
impl From<&str> for ScalingType
source§impl FromStr for ScalingType
impl FromStr for ScalingType
source§impl Hash for ScalingType
impl Hash for ScalingType
source§impl Ord for ScalingType
impl Ord for ScalingType
source§fn cmp(&self, other: &ScalingType) -> Ordering
fn cmp(&self, other: &ScalingType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<ScalingType> for ScalingType
impl PartialEq<ScalingType> for ScalingType
source§fn eq(&self, other: &ScalingType) -> bool
fn eq(&self, other: &ScalingType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<ScalingType> for ScalingType
impl PartialOrd<ScalingType> for ScalingType
source§fn partial_cmp(&self, other: &ScalingType) -> Option<Ordering>
fn partial_cmp(&self, other: &ScalingType) -> 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 ScalingType
impl StructuralEq for ScalingType
impl StructuralPartialEq for ScalingType
Auto Trait Implementations§
impl RefUnwindSafe for ScalingType
impl Send for ScalingType
impl Sync for ScalingType
impl Unpin for ScalingType
impl UnwindSafe for ScalingType
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.