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