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