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