#[non_exhaustive]pub enum JobScheduleDayOfTheWeek {
Friday,
Monday,
Saturday,
Sunday,
Thursday,
Tuesday,
Wednesday,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against JobScheduleDayOfTheWeek
, 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 jobscheduledayoftheweek = unimplemented!();
match jobscheduledayoftheweek {
JobScheduleDayOfTheWeek::Friday => { /* ... */ },
JobScheduleDayOfTheWeek::Monday => { /* ... */ },
JobScheduleDayOfTheWeek::Saturday => { /* ... */ },
JobScheduleDayOfTheWeek::Sunday => { /* ... */ },
JobScheduleDayOfTheWeek::Thursday => { /* ... */ },
JobScheduleDayOfTheWeek::Tuesday => { /* ... */ },
JobScheduleDayOfTheWeek::Wednesday => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when jobscheduledayoftheweek
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant JobScheduleDayOfTheWeek::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
JobScheduleDayOfTheWeek::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 JobScheduleDayOfTheWeek::NewFeature
is defined.
Specifically, when jobscheduledayoftheweek
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on JobScheduleDayOfTheWeek::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
Friday
Monday
Saturday
Sunday
Thursday
Tuesday
Wednesday
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 JobScheduleDayOfTheWeek
impl JobScheduleDayOfTheWeek
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 JobScheduleDayOfTheWeek
impl AsRef<str> for JobScheduleDayOfTheWeek
source§impl Clone for JobScheduleDayOfTheWeek
impl Clone for JobScheduleDayOfTheWeek
source§fn clone(&self) -> JobScheduleDayOfTheWeek
fn clone(&self) -> JobScheduleDayOfTheWeek
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for JobScheduleDayOfTheWeek
impl Debug for JobScheduleDayOfTheWeek
source§impl Display for JobScheduleDayOfTheWeek
impl Display for JobScheduleDayOfTheWeek
source§impl From<&str> for JobScheduleDayOfTheWeek
impl From<&str> for JobScheduleDayOfTheWeek
source§impl FromStr for JobScheduleDayOfTheWeek
impl FromStr for JobScheduleDayOfTheWeek
source§impl Hash for JobScheduleDayOfTheWeek
impl Hash for JobScheduleDayOfTheWeek
source§impl Ord for JobScheduleDayOfTheWeek
impl Ord for JobScheduleDayOfTheWeek
source§fn cmp(&self, other: &JobScheduleDayOfTheWeek) -> Ordering
fn cmp(&self, other: &JobScheduleDayOfTheWeek) -> 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 JobScheduleDayOfTheWeek
impl PartialEq for JobScheduleDayOfTheWeek
source§fn eq(&self, other: &JobScheduleDayOfTheWeek) -> bool
fn eq(&self, other: &JobScheduleDayOfTheWeek) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for JobScheduleDayOfTheWeek
impl PartialOrd for JobScheduleDayOfTheWeek
source§fn partial_cmp(&self, other: &JobScheduleDayOfTheWeek) -> Option<Ordering>
fn partial_cmp(&self, other: &JobScheduleDayOfTheWeek) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for JobScheduleDayOfTheWeek
impl StructuralPartialEq for JobScheduleDayOfTheWeek
Auto Trait Implementations§
impl Freeze for JobScheduleDayOfTheWeek
impl RefUnwindSafe for JobScheduleDayOfTheWeek
impl Send for JobScheduleDayOfTheWeek
impl Sync for JobScheduleDayOfTheWeek
impl Unpin for JobScheduleDayOfTheWeek
impl UnwindSafe for JobScheduleDayOfTheWeek
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more