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