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