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