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