#[non_exhaustive]pub enum DashboardBehavior {
Disabled,
Enabled,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against DashboardBehavior, 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 dashboardbehavior = unimplemented!();
match dashboardbehavior {
DashboardBehavior::Disabled => { /* ... */ },
DashboardBehavior::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dashboardbehavior represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DashboardBehavior::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
DashboardBehavior::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 DashboardBehavior::NewFeature is defined.
Specifically, when dashboardbehavior represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on DashboardBehavior::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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 DashboardBehavior
impl DashboardBehavior
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 DashboardBehavior
impl AsRef<str> for DashboardBehavior
source§impl Clone for DashboardBehavior
impl Clone for DashboardBehavior
source§fn clone(&self) -> DashboardBehavior
fn clone(&self) -> DashboardBehavior
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for DashboardBehavior
impl Debug for DashboardBehavior
source§impl Display for DashboardBehavior
impl Display for DashboardBehavior
source§impl From<&str> for DashboardBehavior
impl From<&str> for DashboardBehavior
source§impl FromStr for DashboardBehavior
impl FromStr for DashboardBehavior
source§impl Hash for DashboardBehavior
impl Hash for DashboardBehavior
source§impl Ord for DashboardBehavior
impl Ord for DashboardBehavior
source§fn cmp(&self, other: &DashboardBehavior) -> Ordering
fn cmp(&self, other: &DashboardBehavior) -> 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 DashboardBehavior
impl PartialEq for DashboardBehavior
source§impl PartialOrd for DashboardBehavior
impl PartialOrd for DashboardBehavior
impl Eq for DashboardBehavior
impl StructuralPartialEq for DashboardBehavior
Auto Trait Implementations§
impl Freeze for DashboardBehavior
impl RefUnwindSafe for DashboardBehavior
impl Send for DashboardBehavior
impl Sync for DashboardBehavior
impl Unpin for DashboardBehavior
impl UnwindSafe for DashboardBehavior
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§unsafe fn clone_to_uninit(&self, dst: *mut T)
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.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self into a Left variant of Either<Self, Self>
if into_left is true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self into a Left variant of Either<Self, Self>
if into_left(&self) returns true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read more