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