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