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