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