#[non_exhaustive]pub enum ActionAfterCompletion {
Delete,
None,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against ActionAfterCompletion, 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 actionaftercompletion = unimplemented!();
match actionaftercompletion {
ActionAfterCompletion::Delete => { /* ... */ },
ActionAfterCompletion::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when actionaftercompletion represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ActionAfterCompletion::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
ActionAfterCompletion::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 ActionAfterCompletion::NewFeature is defined.
Specifically, when actionaftercompletion represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on ActionAfterCompletion::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
Delete
None
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 ActionAfterCompletion
impl ActionAfterCompletion
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 ActionAfterCompletion
impl AsRef<str> for ActionAfterCompletion
source§impl Clone for ActionAfterCompletion
impl Clone for ActionAfterCompletion
source§fn clone(&self) -> ActionAfterCompletion
fn clone(&self) -> ActionAfterCompletion
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for ActionAfterCompletion
impl Debug for ActionAfterCompletion
source§impl From<&str> for ActionAfterCompletion
impl From<&str> for ActionAfterCompletion
source§impl FromStr for ActionAfterCompletion
impl FromStr for ActionAfterCompletion
source§impl Hash for ActionAfterCompletion
impl Hash for ActionAfterCompletion
source§impl Ord for ActionAfterCompletion
impl Ord for ActionAfterCompletion
source§fn cmp(&self, other: &ActionAfterCompletion) -> Ordering
fn cmp(&self, other: &ActionAfterCompletion) -> 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 ActionAfterCompletion
impl PartialEq for ActionAfterCompletion
source§fn eq(&self, other: &ActionAfterCompletion) -> bool
fn eq(&self, other: &ActionAfterCompletion) -> bool
self and other values to be equal, and is used
by ==.source§impl PartialOrd for ActionAfterCompletion
impl PartialOrd for ActionAfterCompletion
source§fn partial_cmp(&self, other: &ActionAfterCompletion) -> Option<Ordering>
fn partial_cmp(&self, other: &ActionAfterCompletion) -> 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 ActionAfterCompletion
impl StructuralEq for ActionAfterCompletion
impl StructuralPartialEq for ActionAfterCompletion
Auto Trait Implementations§
impl RefUnwindSafe for ActionAfterCompletion
impl Send for ActionAfterCompletion
impl Sync for ActionAfterCompletion
impl Unpin for ActionAfterCompletion
impl UnwindSafe for ActionAfterCompletion
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.