#[non_exhaustive]pub enum Ac3MetadataControl {
FollowInput,
UseConfigured,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Ac3MetadataControl
, 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 ac3metadatacontrol = unimplemented!();
match ac3metadatacontrol {
Ac3MetadataControl::FollowInput => { /* ... */ },
Ac3MetadataControl::UseConfigured => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when ac3metadatacontrol
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Ac3MetadataControl::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Ac3MetadataControl::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 Ac3MetadataControl::NewFeature
is defined.
Specifically, when ac3metadatacontrol
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Ac3MetadataControl::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. When set to FOLLOW_INPUT, encoder metadata will be sourced from the DD, DD+, or DolbyE decoder that supplied this audio data. If audio was not supplied from one of these streams, then the static metadata settings will be used.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
FollowInput
UseConfigured
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 Ac3MetadataControl
impl Ac3MetadataControl
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 Ac3MetadataControl
impl AsRef<str> for Ac3MetadataControl
source§impl Clone for Ac3MetadataControl
impl Clone for Ac3MetadataControl
source§fn clone(&self) -> Ac3MetadataControl
fn clone(&self) -> Ac3MetadataControl
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Ac3MetadataControl
impl Debug for Ac3MetadataControl
source§impl Display for Ac3MetadataControl
impl Display for Ac3MetadataControl
source§impl From<&str> for Ac3MetadataControl
impl From<&str> for Ac3MetadataControl
source§impl FromStr for Ac3MetadataControl
impl FromStr for Ac3MetadataControl
source§impl Hash for Ac3MetadataControl
impl Hash for Ac3MetadataControl
source§impl Ord for Ac3MetadataControl
impl Ord for Ac3MetadataControl
source§fn cmp(&self, other: &Ac3MetadataControl) -> Ordering
fn cmp(&self, other: &Ac3MetadataControl) -> 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 Ac3MetadataControl
impl PartialEq for Ac3MetadataControl
source§fn eq(&self, other: &Ac3MetadataControl) -> bool
fn eq(&self, other: &Ac3MetadataControl) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Ac3MetadataControl
impl PartialOrd for Ac3MetadataControl
source§fn partial_cmp(&self, other: &Ac3MetadataControl) -> Option<Ordering>
fn partial_cmp(&self, other: &Ac3MetadataControl) -> 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 Ac3MetadataControl
impl StructuralPartialEq for Ac3MetadataControl
Auto Trait Implementations§
impl Freeze for Ac3MetadataControl
impl RefUnwindSafe for Ac3MetadataControl
impl Send for Ac3MetadataControl
impl Sync for Ac3MetadataControl
impl Unpin for Ac3MetadataControl
impl UnwindSafe for Ac3MetadataControl
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