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