#[non_exhaustive]
pub enum InstanceAccessControlAttributeConfigurationStatus {
CreationFailed,
CreationInProgress,
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against InstanceAccessControlAttributeConfigurationStatus
, 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 instanceaccesscontrolattributeconfigurationstatus = unimplemented!();
match instanceaccesscontrolattributeconfigurationstatus {
InstanceAccessControlAttributeConfigurationStatus::CreationFailed => { /* ... */ },
InstanceAccessControlAttributeConfigurationStatus::CreationInProgress => { /* ... */ },
InstanceAccessControlAttributeConfigurationStatus::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when instanceaccesscontrolattributeconfigurationstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant InstanceAccessControlAttributeConfigurationStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
InstanceAccessControlAttributeConfigurationStatus::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 InstanceAccessControlAttributeConfigurationStatus::NewFeature
is defined.
Specifically, when instanceaccesscontrolattributeconfigurationstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on InstanceAccessControlAttributeConfigurationStatus::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
CreationFailed
CreationInProgress
Enabled
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl Clone for InstanceAccessControlAttributeConfigurationStatus
impl Clone for InstanceAccessControlAttributeConfigurationStatus
source§fn clone(&self) -> InstanceAccessControlAttributeConfigurationStatus
fn clone(&self) -> InstanceAccessControlAttributeConfigurationStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Ord for InstanceAccessControlAttributeConfigurationStatus
impl Ord for InstanceAccessControlAttributeConfigurationStatus
source§fn cmp(
&self,
other: &InstanceAccessControlAttributeConfigurationStatus
) -> Ordering
fn cmp(
&self,
other: &InstanceAccessControlAttributeConfigurationStatus
) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<InstanceAccessControlAttributeConfigurationStatus> for InstanceAccessControlAttributeConfigurationStatus
impl PartialEq<InstanceAccessControlAttributeConfigurationStatus> for InstanceAccessControlAttributeConfigurationStatus
source§fn eq(&self, other: &InstanceAccessControlAttributeConfigurationStatus) -> bool
fn eq(&self, other: &InstanceAccessControlAttributeConfigurationStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<InstanceAccessControlAttributeConfigurationStatus> for InstanceAccessControlAttributeConfigurationStatus
impl PartialOrd<InstanceAccessControlAttributeConfigurationStatus> for InstanceAccessControlAttributeConfigurationStatus
source§fn partial_cmp(
&self,
other: &InstanceAccessControlAttributeConfigurationStatus
) -> Option<Ordering>
fn partial_cmp(
&self,
other: &InstanceAccessControlAttributeConfigurationStatus
) -> 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 InstanceAccessControlAttributeConfigurationStatus
impl StructuralEq for InstanceAccessControlAttributeConfigurationStatus
impl StructuralPartialEq for InstanceAccessControlAttributeConfigurationStatus
Auto Trait Implementations§
impl RefUnwindSafe for InstanceAccessControlAttributeConfigurationStatus
impl Send for InstanceAccessControlAttributeConfigurationStatus
impl Sync for InstanceAccessControlAttributeConfigurationStatus
impl Unpin for InstanceAccessControlAttributeConfigurationStatus
impl UnwindSafe for InstanceAccessControlAttributeConfigurationStatus
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.