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