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