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