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