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