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