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