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