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