#[non_exhaustive]pub enum ControlSetStatus {
Active,
Reviewed,
UnderReview,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against ControlSetStatus, 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 controlsetstatus = unimplemented!();
match controlsetstatus {
ControlSetStatus::Active => { /* ... */ },
ControlSetStatus::Reviewed => { /* ... */ },
ControlSetStatus::UnderReview => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when controlsetstatus represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ControlSetStatus::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
ControlSetStatus::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 ControlSetStatus::NewFeature is defined.
Specifically, when controlsetstatus represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on ControlSetStatus::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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
Reviewed
UnderReview
Unknown(UnknownVariantValue)
Unknown contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for ControlSetStatus
impl AsRef<str> for ControlSetStatus
source§impl Clone for ControlSetStatus
impl Clone for ControlSetStatus
source§fn clone(&self) -> ControlSetStatus
fn clone(&self) -> ControlSetStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for ControlSetStatus
impl Debug for ControlSetStatus
source§impl From<&str> for ControlSetStatus
impl From<&str> for ControlSetStatus
source§impl FromStr for ControlSetStatus
impl FromStr for ControlSetStatus
source§impl Hash for ControlSetStatus
impl Hash for ControlSetStatus
source§impl Ord for ControlSetStatus
impl Ord for ControlSetStatus
source§fn cmp(&self, other: &ControlSetStatus) -> Ordering
fn cmp(&self, other: &ControlSetStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<ControlSetStatus> for ControlSetStatus
impl PartialEq<ControlSetStatus> for ControlSetStatus
source§fn eq(&self, other: &ControlSetStatus) -> bool
fn eq(&self, other: &ControlSetStatus) -> bool
self and other values to be equal, and is used
by ==.source§impl PartialOrd<ControlSetStatus> for ControlSetStatus
impl PartialOrd<ControlSetStatus> for ControlSetStatus
source§fn partial_cmp(&self, other: &ControlSetStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &ControlSetStatus) -> 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 ControlSetStatus
impl StructuralEq for ControlSetStatus
impl StructuralPartialEq for ControlSetStatus
Auto Trait Implementations§
impl RefUnwindSafe for ControlSetStatus
impl Send for ControlSetStatus
impl Sync for ControlSetStatus
impl Unpin for ControlSetStatus
impl UnwindSafe for ControlSetStatus
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> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key and return true if they are equal.