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