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