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