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