#[non_exhaustive]pub enum S3ObjectLockRetentionMode {
Compliance,
Governance,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against S3ObjectLockRetentionMode
, 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 s3objectlockretentionmode = unimplemented!();
match s3objectlockretentionmode {
S3ObjectLockRetentionMode::Compliance => { /* ... */ },
S3ObjectLockRetentionMode::Governance => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when s3objectlockretentionmode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant S3ObjectLockRetentionMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
S3ObjectLockRetentionMode::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 S3ObjectLockRetentionMode::NewFeature
is defined.
Specifically, when s3objectlockretentionmode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on S3ObjectLockRetentionMode::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 S3ObjectLockRetentionMode
impl S3ObjectLockRetentionMode
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 S3ObjectLockRetentionMode
impl AsRef<str> for S3ObjectLockRetentionMode
source§impl Clone for S3ObjectLockRetentionMode
impl Clone for S3ObjectLockRetentionMode
source§fn clone(&self) -> S3ObjectLockRetentionMode
fn clone(&self) -> S3ObjectLockRetentionMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for S3ObjectLockRetentionMode
impl Debug for S3ObjectLockRetentionMode
source§impl From<&str> for S3ObjectLockRetentionMode
impl From<&str> for S3ObjectLockRetentionMode
source§impl FromStr for S3ObjectLockRetentionMode
impl FromStr for S3ObjectLockRetentionMode
source§impl Hash for S3ObjectLockRetentionMode
impl Hash for S3ObjectLockRetentionMode
source§impl Ord for S3ObjectLockRetentionMode
impl Ord for S3ObjectLockRetentionMode
source§fn cmp(&self, other: &S3ObjectLockRetentionMode) -> Ordering
fn cmp(&self, other: &S3ObjectLockRetentionMode) -> 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 S3ObjectLockRetentionMode
impl PartialEq for S3ObjectLockRetentionMode
source§fn eq(&self, other: &S3ObjectLockRetentionMode) -> bool
fn eq(&self, other: &S3ObjectLockRetentionMode) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for S3ObjectLockRetentionMode
impl PartialOrd for S3ObjectLockRetentionMode
source§fn partial_cmp(&self, other: &S3ObjectLockRetentionMode) -> Option<Ordering>
fn partial_cmp(&self, other: &S3ObjectLockRetentionMode) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for S3ObjectLockRetentionMode
impl StructuralEq for S3ObjectLockRetentionMode
impl StructuralPartialEq for S3ObjectLockRetentionMode
Auto Trait Implementations§
impl RefUnwindSafe for S3ObjectLockRetentionMode
impl Send for S3ObjectLockRetentionMode
impl Sync for S3ObjectLockRetentionMode
impl Unpin for S3ObjectLockRetentionMode
impl UnwindSafe for S3ObjectLockRetentionMode
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
§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.