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