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