Enum aws_sdk_s3::types::DataRedundancy
source · #[non_exhaustive]pub enum DataRedundancy {
SingleAvailabilityZone,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DataRedundancy
, 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 dataredundancy = unimplemented!();
match dataredundancy {
DataRedundancy::SingleAvailabilityZone => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dataredundancy
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DataRedundancy::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DataRedundancy::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 DataRedundancy::NewFeature
is defined.
Specifically, when dataredundancy
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DataRedundancy::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
SingleAvailabilityZone
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 DataRedundancy
impl DataRedundancy
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 DataRedundancy
impl AsRef<str> for DataRedundancy
source§impl Clone for DataRedundancy
impl Clone for DataRedundancy
source§fn clone(&self) -> DataRedundancy
fn clone(&self) -> DataRedundancy
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DataRedundancy
impl Debug for DataRedundancy
source§impl Display for DataRedundancy
impl Display for DataRedundancy
source§impl From<&str> for DataRedundancy
impl From<&str> for DataRedundancy
source§impl FromStr for DataRedundancy
impl FromStr for DataRedundancy
source§impl Hash for DataRedundancy
impl Hash for DataRedundancy
source§impl Ord for DataRedundancy
impl Ord for DataRedundancy
source§fn cmp(&self, other: &DataRedundancy) -> Ordering
fn cmp(&self, other: &DataRedundancy) -> 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 DataRedundancy
impl PartialEq for DataRedundancy
source§impl PartialOrd for DataRedundancy
impl PartialOrd for DataRedundancy
impl Eq for DataRedundancy
impl StructuralPartialEq for DataRedundancy
Auto Trait Implementations§
impl Freeze for DataRedundancy
impl RefUnwindSafe for DataRedundancy
impl Send for DataRedundancy
impl Sync for DataRedundancy
impl Unpin for DataRedundancy
impl UnwindSafe for DataRedundancy
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.