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