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