#[non_exhaustive]
pub enum HoursOfOperationDays {
Friday,
Monday,
Saturday,
Sunday,
Thursday,
Tuesday,
Wednesday,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against HoursOfOperationDays
, 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 hoursofoperationdays = unimplemented!();
match hoursofoperationdays {
HoursOfOperationDays::Friday => { /* ... */ },
HoursOfOperationDays::Monday => { /* ... */ },
HoursOfOperationDays::Saturday => { /* ... */ },
HoursOfOperationDays::Sunday => { /* ... */ },
HoursOfOperationDays::Thursday => { /* ... */ },
HoursOfOperationDays::Tuesday => { /* ... */ },
HoursOfOperationDays::Wednesday => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when hoursofoperationdays
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant HoursOfOperationDays::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
HoursOfOperationDays::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 HoursOfOperationDays::NewFeature
is defined.
Specifically, when hoursofoperationdays
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on HoursOfOperationDays::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
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for HoursOfOperationDays
impl AsRef<str> for HoursOfOperationDays
source§impl Clone for HoursOfOperationDays
impl Clone for HoursOfOperationDays
source§fn clone(&self) -> HoursOfOperationDays
fn clone(&self) -> HoursOfOperationDays
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for HoursOfOperationDays
impl Debug for HoursOfOperationDays
source§impl From<&str> for HoursOfOperationDays
impl From<&str> for HoursOfOperationDays
source§impl FromStr for HoursOfOperationDays
impl FromStr for HoursOfOperationDays
source§impl Hash for HoursOfOperationDays
impl Hash for HoursOfOperationDays
source§impl Ord for HoursOfOperationDays
impl Ord for HoursOfOperationDays
source§fn cmp(&self, other: &HoursOfOperationDays) -> Ordering
fn cmp(&self, other: &HoursOfOperationDays) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<HoursOfOperationDays> for HoursOfOperationDays
impl PartialEq<HoursOfOperationDays> for HoursOfOperationDays
source§fn eq(&self, other: &HoursOfOperationDays) -> bool
fn eq(&self, other: &HoursOfOperationDays) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<HoursOfOperationDays> for HoursOfOperationDays
impl PartialOrd<HoursOfOperationDays> for HoursOfOperationDays
source§fn partial_cmp(&self, other: &HoursOfOperationDays) -> Option<Ordering>
fn partial_cmp(&self, other: &HoursOfOperationDays) -> 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 HoursOfOperationDays
impl StructuralEq for HoursOfOperationDays
impl StructuralPartialEq for HoursOfOperationDays
Auto Trait Implementations§
impl RefUnwindSafe for HoursOfOperationDays
impl Send for HoursOfOperationDays
impl Sync for HoursOfOperationDays
impl Unpin for HoursOfOperationDays
impl UnwindSafe for HoursOfOperationDays
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.