#[non_exhaustive]pub enum DashDisplayFragmentTimestamp {
Always,
Never,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DashDisplayFragmentTimestamp
, 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 dashdisplayfragmenttimestamp = unimplemented!();
match dashdisplayfragmenttimestamp {
DashDisplayFragmentTimestamp::Always => { /* ... */ },
DashDisplayFragmentTimestamp::Never => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dashdisplayfragmenttimestamp
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DashDisplayFragmentTimestamp::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DashDisplayFragmentTimestamp::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 DashDisplayFragmentTimestamp::NewFeature
is defined.
Specifically, when dashdisplayfragmenttimestamp
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DashDisplayFragmentTimestamp::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
Always
Never
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 DashDisplayFragmentTimestamp
impl DashDisplayFragmentTimestamp
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 DashDisplayFragmentTimestamp
impl AsRef<str> for DashDisplayFragmentTimestamp
source§impl Clone for DashDisplayFragmentTimestamp
impl Clone for DashDisplayFragmentTimestamp
source§fn clone(&self) -> DashDisplayFragmentTimestamp
fn clone(&self) -> DashDisplayFragmentTimestamp
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DashDisplayFragmentTimestamp
impl Debug for DashDisplayFragmentTimestamp
source§impl From<&str> for DashDisplayFragmentTimestamp
impl From<&str> for DashDisplayFragmentTimestamp
source§impl Hash for DashDisplayFragmentTimestamp
impl Hash for DashDisplayFragmentTimestamp
source§impl Ord for DashDisplayFragmentTimestamp
impl Ord for DashDisplayFragmentTimestamp
source§fn cmp(&self, other: &DashDisplayFragmentTimestamp) -> Ordering
fn cmp(&self, other: &DashDisplayFragmentTimestamp) -> 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 DashDisplayFragmentTimestamp
impl PartialEq for DashDisplayFragmentTimestamp
source§fn eq(&self, other: &DashDisplayFragmentTimestamp) -> bool
fn eq(&self, other: &DashDisplayFragmentTimestamp) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DashDisplayFragmentTimestamp
impl PartialOrd for DashDisplayFragmentTimestamp
source§fn partial_cmp(&self, other: &DashDisplayFragmentTimestamp) -> Option<Ordering>
fn partial_cmp(&self, other: &DashDisplayFragmentTimestamp) -> 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 DashDisplayFragmentTimestamp
impl StructuralEq for DashDisplayFragmentTimestamp
impl StructuralPartialEq for DashDisplayFragmentTimestamp
Auto Trait Implementations§
impl RefUnwindSafe for DashDisplayFragmentTimestamp
impl Send for DashDisplayFragmentTimestamp
impl Sync for DashDisplayFragmentTimestamp
impl Unpin for DashDisplayFragmentTimestamp
impl UnwindSafe for DashDisplayFragmentTimestamp
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
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.