Enum aws_sdk_snowball::types::ClusterState
source · #[non_exhaustive]pub enum ClusterState {
AwaitingQuorum,
Cancelled,
Complete,
InUse,
Pending,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ClusterState
, 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 clusterstate = unimplemented!();
match clusterstate {
ClusterState::AwaitingQuorum => { /* ... */ },
ClusterState::Cancelled => { /* ... */ },
ClusterState::Complete => { /* ... */ },
ClusterState::InUse => { /* ... */ },
ClusterState::Pending => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when clusterstate
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ClusterState::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ClusterState::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 ClusterState::NewFeature
is defined.
Specifically, when clusterstate
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ClusterState::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
AwaitingQuorum
Cancelled
Complete
InUse
Pending
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 ClusterState
impl ClusterState
source§impl ClusterState
impl ClusterState
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 ClusterState
impl AsRef<str> for ClusterState
source§impl Clone for ClusterState
impl Clone for ClusterState
source§fn clone(&self) -> ClusterState
fn clone(&self) -> ClusterState
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ClusterState
impl Debug for ClusterState
source§impl Display for ClusterState
impl Display for ClusterState
source§impl From<&str> for ClusterState
impl From<&str> for ClusterState
source§impl FromStr for ClusterState
impl FromStr for ClusterState
source§impl Hash for ClusterState
impl Hash for ClusterState
source§impl Ord for ClusterState
impl Ord for ClusterState
source§fn cmp(&self, other: &ClusterState) -> Ordering
fn cmp(&self, other: &ClusterState) -> 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 ClusterState
impl PartialEq for ClusterState
source§fn eq(&self, other: &ClusterState) -> bool
fn eq(&self, other: &ClusterState) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ClusterState
impl PartialOrd for ClusterState
source§fn partial_cmp(&self, other: &ClusterState) -> Option<Ordering>
fn partial_cmp(&self, other: &ClusterState) -> 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 ClusterState
impl StructuralPartialEq for ClusterState
Auto Trait Implementations§
impl Freeze for ClusterState
impl RefUnwindSafe for ClusterState
impl Send for ClusterState
impl Sync for ClusterState
impl Unpin for ClusterState
impl UnwindSafe for ClusterState
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.