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