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