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