#[non_exhaustive]pub enum HlsDescriptiveVideoServiceFlag {
DontFlag,
Flag,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against HlsDescriptiveVideoServiceFlag
, 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 hlsdescriptivevideoserviceflag = unimplemented!();
match hlsdescriptivevideoserviceflag {
HlsDescriptiveVideoServiceFlag::DontFlag => { /* ... */ },
HlsDescriptiveVideoServiceFlag::Flag => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when hlsdescriptivevideoserviceflag
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant HlsDescriptiveVideoServiceFlag::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
HlsDescriptiveVideoServiceFlag::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 HlsDescriptiveVideoServiceFlag::NewFeature
is defined.
Specifically, when hlsdescriptivevideoserviceflag
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on HlsDescriptiveVideoServiceFlag::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 to flag this audio track as descriptive video service (DVS) in your HLS parent manifest. When you choose Flag, MediaConvert includes the parameter CHARACTERISTICS=“public.accessibility.describes-video” in the EXT-X-MEDIA entry for this track. When you keep the default choice, Don’t flag, MediaConvert leaves this parameter out. The DVS flag can help with accessibility on Apple devices. For more information, see the Apple documentation.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
DontFlag
Flag
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 HlsDescriptiveVideoServiceFlag
impl HlsDescriptiveVideoServiceFlag
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 HlsDescriptiveVideoServiceFlag
impl AsRef<str> for HlsDescriptiveVideoServiceFlag
source§impl Clone for HlsDescriptiveVideoServiceFlag
impl Clone for HlsDescriptiveVideoServiceFlag
source§fn clone(&self) -> HlsDescriptiveVideoServiceFlag
fn clone(&self) -> HlsDescriptiveVideoServiceFlag
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl From<&str> for HlsDescriptiveVideoServiceFlag
impl From<&str> for HlsDescriptiveVideoServiceFlag
source§impl Ord for HlsDescriptiveVideoServiceFlag
impl Ord for HlsDescriptiveVideoServiceFlag
source§fn cmp(&self, other: &HlsDescriptiveVideoServiceFlag) -> Ordering
fn cmp(&self, other: &HlsDescriptiveVideoServiceFlag) -> 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 HlsDescriptiveVideoServiceFlag
impl PartialEq for HlsDescriptiveVideoServiceFlag
source§fn eq(&self, other: &HlsDescriptiveVideoServiceFlag) -> bool
fn eq(&self, other: &HlsDescriptiveVideoServiceFlag) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for HlsDescriptiveVideoServiceFlag
impl PartialOrd for HlsDescriptiveVideoServiceFlag
source§fn partial_cmp(
&self,
other: &HlsDescriptiveVideoServiceFlag
) -> Option<Ordering>
fn partial_cmp( &self, other: &HlsDescriptiveVideoServiceFlag ) -> 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 HlsDescriptiveVideoServiceFlag
impl StructuralPartialEq for HlsDescriptiveVideoServiceFlag
Auto Trait Implementations§
impl Freeze for HlsDescriptiveVideoServiceFlag
impl RefUnwindSafe for HlsDescriptiveVideoServiceFlag
impl Send for HlsDescriptiveVideoServiceFlag
impl Sync for HlsDescriptiveVideoServiceFlag
impl Unpin for HlsDescriptiveVideoServiceFlag
impl UnwindSafe for HlsDescriptiveVideoServiceFlag
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