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