#[non_exhaustive]pub enum Eac3BitstreamMode {
Commentary,
CompleteMain,
Emergency,
HearingImpaired,
VisuallyImpaired,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Eac3BitstreamMode
, 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 eac3bitstreammode = unimplemented!();
match eac3bitstreammode {
Eac3BitstreamMode::Commentary => { /* ... */ },
Eac3BitstreamMode::CompleteMain => { /* ... */ },
Eac3BitstreamMode::Emergency => { /* ... */ },
Eac3BitstreamMode::HearingImpaired => { /* ... */ },
Eac3BitstreamMode::VisuallyImpaired => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when eac3bitstreammode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Eac3BitstreamMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Eac3BitstreamMode::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 Eac3BitstreamMode::NewFeature
is defined.
Specifically, when eac3bitstreammode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Eac3BitstreamMode::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 the bitstream mode for the E-AC-3 stream that the encoder emits. For more information about the EAC3 bitstream mode, see ATSC A/52-2012 (Annex E).
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Commentary
CompleteMain
Emergency
HearingImpaired
VisuallyImpaired
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 Eac3BitstreamMode
impl Eac3BitstreamMode
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 Eac3BitstreamMode
impl AsRef<str> for Eac3BitstreamMode
source§impl Clone for Eac3BitstreamMode
impl Clone for Eac3BitstreamMode
source§fn clone(&self) -> Eac3BitstreamMode
fn clone(&self) -> Eac3BitstreamMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Eac3BitstreamMode
impl Debug for Eac3BitstreamMode
source§impl Display for Eac3BitstreamMode
impl Display for Eac3BitstreamMode
source§impl From<&str> for Eac3BitstreamMode
impl From<&str> for Eac3BitstreamMode
source§impl FromStr for Eac3BitstreamMode
impl FromStr for Eac3BitstreamMode
source§impl Hash for Eac3BitstreamMode
impl Hash for Eac3BitstreamMode
source§impl Ord for Eac3BitstreamMode
impl Ord for Eac3BitstreamMode
source§fn cmp(&self, other: &Eac3BitstreamMode) -> Ordering
fn cmp(&self, other: &Eac3BitstreamMode) -> 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 Eac3BitstreamMode
impl PartialEq for Eac3BitstreamMode
source§fn eq(&self, other: &Eac3BitstreamMode) -> bool
fn eq(&self, other: &Eac3BitstreamMode) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Eac3BitstreamMode
impl PartialOrd for Eac3BitstreamMode
source§fn partial_cmp(&self, other: &Eac3BitstreamMode) -> Option<Ordering>
fn partial_cmp(&self, other: &Eac3BitstreamMode) -> 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 Eac3BitstreamMode
impl StructuralPartialEq for Eac3BitstreamMode
Auto Trait Implementations§
impl Freeze for Eac3BitstreamMode
impl RefUnwindSafe for Eac3BitstreamMode
impl Send for Eac3BitstreamMode
impl Sync for Eac3BitstreamMode
impl Unpin for Eac3BitstreamMode
impl UnwindSafe for Eac3BitstreamMode
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