#[non_exhaustive]pub enum DvbSubtitlingType {
HearingImpaired,
Standard,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DvbSubtitlingType
, 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 dvbsubtitlingtype = unimplemented!();
match dvbsubtitlingtype {
DvbSubtitlingType::HearingImpaired => { /* ... */ },
DvbSubtitlingType::Standard => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dvbsubtitlingtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DvbSubtitlingType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DvbSubtitlingType::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 DvbSubtitlingType::NewFeature
is defined.
Specifically, when dvbsubtitlingtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DvbSubtitlingType::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. Specify whether your DVB subtitles are standard or for hearing impaired. Choose hearing impaired if your subtitles include audio descriptions and dialogue. Choose standard if your subtitles include only dialogue.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
HearingImpaired
Standard
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 DvbSubtitlingType
impl DvbSubtitlingType
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 DvbSubtitlingType
impl AsRef<str> for DvbSubtitlingType
source§impl Clone for DvbSubtitlingType
impl Clone for DvbSubtitlingType
source§fn clone(&self) -> DvbSubtitlingType
fn clone(&self) -> DvbSubtitlingType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DvbSubtitlingType
impl Debug for DvbSubtitlingType
source§impl Display for DvbSubtitlingType
impl Display for DvbSubtitlingType
source§impl From<&str> for DvbSubtitlingType
impl From<&str> for DvbSubtitlingType
source§impl FromStr for DvbSubtitlingType
impl FromStr for DvbSubtitlingType
source§impl Hash for DvbSubtitlingType
impl Hash for DvbSubtitlingType
source§impl Ord for DvbSubtitlingType
impl Ord for DvbSubtitlingType
source§fn cmp(&self, other: &DvbSubtitlingType) -> Ordering
fn cmp(&self, other: &DvbSubtitlingType) -> 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 DvbSubtitlingType
impl PartialEq for DvbSubtitlingType
source§fn eq(&self, other: &DvbSubtitlingType) -> bool
fn eq(&self, other: &DvbSubtitlingType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DvbSubtitlingType
impl PartialOrd for DvbSubtitlingType
source§fn partial_cmp(&self, other: &DvbSubtitlingType) -> Option<Ordering>
fn partial_cmp(&self, other: &DvbSubtitlingType) -> 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 DvbSubtitlingType
impl StructuralPartialEq for DvbSubtitlingType
Auto Trait Implementations§
impl Freeze for DvbSubtitlingType
impl RefUnwindSafe for DvbSubtitlingType
impl Send for DvbSubtitlingType
impl Sync for DvbSubtitlingType
impl Unpin for DvbSubtitlingType
impl UnwindSafe for DvbSubtitlingType
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