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