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