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