#[non_exhaustive]pub enum StorageClassAnalysisSchemaVersion {
V1,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against StorageClassAnalysisSchemaVersion
, 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 storageclassanalysisschemaversion = unimplemented!();
match storageclassanalysisschemaversion {
StorageClassAnalysisSchemaVersion::V1 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when storageclassanalysisschemaversion
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant StorageClassAnalysisSchemaVersion::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
StorageClassAnalysisSchemaVersion::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 StorageClassAnalysisSchemaVersion::NewFeature
is defined.
Specifically, when storageclassanalysisschemaversion
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on StorageClassAnalysisSchemaVersion::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
V1
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 StorageClassAnalysisSchemaVersion
impl StorageClassAnalysisSchemaVersion
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 StorageClassAnalysisSchemaVersion
impl AsRef<str> for StorageClassAnalysisSchemaVersion
source§impl Clone for StorageClassAnalysisSchemaVersion
impl Clone for StorageClassAnalysisSchemaVersion
source§fn clone(&self) -> StorageClassAnalysisSchemaVersion
fn clone(&self) -> StorageClassAnalysisSchemaVersion
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl From<&str> for StorageClassAnalysisSchemaVersion
impl From<&str> for StorageClassAnalysisSchemaVersion
source§impl Ord for StorageClassAnalysisSchemaVersion
impl Ord for StorageClassAnalysisSchemaVersion
source§fn cmp(&self, other: &StorageClassAnalysisSchemaVersion) -> Ordering
fn cmp(&self, other: &StorageClassAnalysisSchemaVersion) -> 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 StorageClassAnalysisSchemaVersion
impl PartialEq for StorageClassAnalysisSchemaVersion
source§fn eq(&self, other: &StorageClassAnalysisSchemaVersion) -> bool
fn eq(&self, other: &StorageClassAnalysisSchemaVersion) -> bool
self
and other
values to be equal, and is used by ==
.source§impl PartialOrd for StorageClassAnalysisSchemaVersion
impl PartialOrd for StorageClassAnalysisSchemaVersion
impl Eq for StorageClassAnalysisSchemaVersion
impl StructuralPartialEq for StorageClassAnalysisSchemaVersion
Auto Trait Implementations§
impl Freeze for StorageClassAnalysisSchemaVersion
impl RefUnwindSafe for StorageClassAnalysisSchemaVersion
impl Send for StorageClassAnalysisSchemaVersion
impl Sync for StorageClassAnalysisSchemaVersion
impl Unpin for StorageClassAnalysisSchemaVersion
impl UnwindSafe for StorageClassAnalysisSchemaVersion
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)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.