#[non_exhaustive]pub enum MpdTimedMetadataBoxVersion {
Version0,
Version1,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MpdTimedMetadataBoxVersion
, 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 mpdtimedmetadataboxversion = unimplemented!();
match mpdtimedmetadataboxversion {
MpdTimedMetadataBoxVersion::Version0 => { /* ... */ },
MpdTimedMetadataBoxVersion::Version1 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mpdtimedmetadataboxversion
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MpdTimedMetadataBoxVersion::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MpdTimedMetadataBoxVersion::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 MpdTimedMetadataBoxVersion::NewFeature
is defined.
Specifically, when mpdtimedmetadataboxversion
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MpdTimedMetadataBoxVersion::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 event message box (eMSG) version for ID3 timed metadata in your output. For more information, see ISO/IEC 23009-1:2022 section 5.10.3.3.3 Syntax. Leave blank to use the default value Version 0. When you specify Version 1, you must also set ID3 metadata to Passthrough.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Version0
Version1
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 MpdTimedMetadataBoxVersion
impl MpdTimedMetadataBoxVersion
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 MpdTimedMetadataBoxVersion
impl AsRef<str> for MpdTimedMetadataBoxVersion
source§impl Clone for MpdTimedMetadataBoxVersion
impl Clone for MpdTimedMetadataBoxVersion
source§fn clone(&self) -> MpdTimedMetadataBoxVersion
fn clone(&self) -> MpdTimedMetadataBoxVersion
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for MpdTimedMetadataBoxVersion
impl Debug for MpdTimedMetadataBoxVersion
source§impl Display for MpdTimedMetadataBoxVersion
impl Display for MpdTimedMetadataBoxVersion
source§impl From<&str> for MpdTimedMetadataBoxVersion
impl From<&str> for MpdTimedMetadataBoxVersion
source§impl FromStr for MpdTimedMetadataBoxVersion
impl FromStr for MpdTimedMetadataBoxVersion
source§impl Hash for MpdTimedMetadataBoxVersion
impl Hash for MpdTimedMetadataBoxVersion
source§impl Ord for MpdTimedMetadataBoxVersion
impl Ord for MpdTimedMetadataBoxVersion
source§fn cmp(&self, other: &MpdTimedMetadataBoxVersion) -> Ordering
fn cmp(&self, other: &MpdTimedMetadataBoxVersion) -> 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 MpdTimedMetadataBoxVersion
impl PartialEq for MpdTimedMetadataBoxVersion
source§fn eq(&self, other: &MpdTimedMetadataBoxVersion) -> bool
fn eq(&self, other: &MpdTimedMetadataBoxVersion) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for MpdTimedMetadataBoxVersion
impl PartialOrd for MpdTimedMetadataBoxVersion
source§fn partial_cmp(&self, other: &MpdTimedMetadataBoxVersion) -> Option<Ordering>
fn partial_cmp(&self, other: &MpdTimedMetadataBoxVersion) -> 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 MpdTimedMetadataBoxVersion
impl StructuralPartialEq for MpdTimedMetadataBoxVersion
Auto Trait Implementations§
impl Freeze for MpdTimedMetadataBoxVersion
impl RefUnwindSafe for MpdTimedMetadataBoxVersion
impl Send for MpdTimedMetadataBoxVersion
impl Sync for MpdTimedMetadataBoxVersion
impl Unpin for MpdTimedMetadataBoxVersion
impl UnwindSafe for MpdTimedMetadataBoxVersion
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