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