#[non_exhaustive]
pub enum DeviceDeploymentStatus {
Deployed,
Failed,
InProgress,
ReadyToDeploy,
Stopped,
Stopping,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DeviceDeploymentStatus
, 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 devicedeploymentstatus = unimplemented!();
match devicedeploymentstatus {
DeviceDeploymentStatus::Deployed => { /* ... */ },
DeviceDeploymentStatus::Failed => { /* ... */ },
DeviceDeploymentStatus::InProgress => { /* ... */ },
DeviceDeploymentStatus::ReadyToDeploy => { /* ... */ },
DeviceDeploymentStatus::Stopped => { /* ... */ },
DeviceDeploymentStatus::Stopping => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when devicedeploymentstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DeviceDeploymentStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DeviceDeploymentStatus::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 DeviceDeploymentStatus::NewFeature
is defined.
Specifically, when devicedeploymentstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DeviceDeploymentStatus::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
Deployed
Failed
InProgress
ReadyToDeploy
Stopped
Stopping
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for DeviceDeploymentStatus
impl AsRef<str> for DeviceDeploymentStatus
source§impl Clone for DeviceDeploymentStatus
impl Clone for DeviceDeploymentStatus
source§fn clone(&self) -> DeviceDeploymentStatus
fn clone(&self) -> DeviceDeploymentStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DeviceDeploymentStatus
impl Debug for DeviceDeploymentStatus
source§impl From<&str> for DeviceDeploymentStatus
impl From<&str> for DeviceDeploymentStatus
source§impl FromStr for DeviceDeploymentStatus
impl FromStr for DeviceDeploymentStatus
source§impl Hash for DeviceDeploymentStatus
impl Hash for DeviceDeploymentStatus
source§impl Ord for DeviceDeploymentStatus
impl Ord for DeviceDeploymentStatus
source§fn cmp(&self, other: &DeviceDeploymentStatus) -> Ordering
fn cmp(&self, other: &DeviceDeploymentStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<DeviceDeploymentStatus> for DeviceDeploymentStatus
impl PartialEq<DeviceDeploymentStatus> for DeviceDeploymentStatus
source§fn eq(&self, other: &DeviceDeploymentStatus) -> bool
fn eq(&self, other: &DeviceDeploymentStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<DeviceDeploymentStatus> for DeviceDeploymentStatus
impl PartialOrd<DeviceDeploymentStatus> for DeviceDeploymentStatus
source§fn partial_cmp(&self, other: &DeviceDeploymentStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &DeviceDeploymentStatus) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for DeviceDeploymentStatus
impl StructuralEq for DeviceDeploymentStatus
impl StructuralPartialEq for DeviceDeploymentStatus
Auto Trait Implementations§
impl RefUnwindSafe for DeviceDeploymentStatus
impl Send for DeviceDeploymentStatus
impl Sync for DeviceDeploymentStatus
impl Unpin for DeviceDeploymentStatus
impl UnwindSafe for DeviceDeploymentStatus
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.