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