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