#[non_exhaustive]pub enum GuadrailAction {
Intervened,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against GuadrailAction
, 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 guadrailaction = unimplemented!();
match guadrailaction {
GuadrailAction::Intervened => { /* ... */ },
GuadrailAction::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when guadrailaction
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant GuadrailAction::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
GuadrailAction::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 GuadrailAction::NewFeature
is defined.
Specifically, when guadrailaction
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on GuadrailAction::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
Intervened
None
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 GuadrailAction
impl GuadrailAction
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 GuadrailAction
impl AsRef<str> for GuadrailAction
Source§impl Clone for GuadrailAction
impl Clone for GuadrailAction
Source§fn clone(&self) -> GuadrailAction
fn clone(&self) -> GuadrailAction
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for GuadrailAction
impl Debug for GuadrailAction
Source§impl Display for GuadrailAction
impl Display for GuadrailAction
Source§impl From<&str> for GuadrailAction
impl From<&str> for GuadrailAction
Source§impl FromStr for GuadrailAction
impl FromStr for GuadrailAction
Source§impl Hash for GuadrailAction
impl Hash for GuadrailAction
Source§impl Ord for GuadrailAction
impl Ord for GuadrailAction
Source§fn cmp(&self, other: &GuadrailAction) -> Ordering
fn cmp(&self, other: &GuadrailAction) -> 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 GuadrailAction
impl PartialEq for GuadrailAction
Source§impl PartialOrd for GuadrailAction
impl PartialOrd for GuadrailAction
impl Eq for GuadrailAction
impl StructuralPartialEq for GuadrailAction
Auto Trait Implementations§
impl Freeze for GuadrailAction
impl RefUnwindSafe for GuadrailAction
impl Send for GuadrailAction
impl Sync for GuadrailAction
impl Unpin for GuadrailAction
impl UnwindSafe for GuadrailAction
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