Enum aws_sdk_s3::types::MfaDelete
source · #[non_exhaustive]pub enum MfaDelete {
Disabled,
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MfaDelete
, 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 mfadelete = unimplemented!();
match mfadelete {
MfaDelete::Disabled => { /* ... */ },
MfaDelete::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mfadelete
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MfaDelete::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MfaDelete::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 MfaDelete::NewFeature
is defined.
Specifically, when mfadelete
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MfaDelete::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§
Trait Implementations§
source§impl Ord for MfaDelete
impl Ord for MfaDelete
source§impl PartialOrd for MfaDelete
impl PartialOrd for MfaDelete
impl Eq for MfaDelete
impl StructuralPartialEq for MfaDelete
Auto Trait Implementations§
impl Freeze for MfaDelete
impl RefUnwindSafe for MfaDelete
impl Send for MfaDelete
impl Sync for MfaDelete
impl Unpin for MfaDelete
impl UnwindSafe for MfaDelete
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.