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