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