#[non_exhaustive]pub enum M2tsPcrControl {
ConfiguredPcrPeriod,
PcrEveryPesPacket,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against M2tsPcrControl
, 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 m2tspcrcontrol = unimplemented!();
match m2tspcrcontrol {
M2tsPcrControl::ConfiguredPcrPeriod => { /* ... */ },
M2tsPcrControl::PcrEveryPesPacket => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when m2tspcrcontrol
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant M2tsPcrControl::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
M2tsPcrControl::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 M2tsPcrControl::NewFeature
is defined.
Specifically, when m2tspcrcontrol
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on M2tsPcrControl::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 PCR_EVERY_PES_PACKET, a Program Clock Reference value is inserted for every Packetized Elementary Stream (PES) header. This is effective only when the PCR PID is the same as the video or audio elementary stream.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
ConfiguredPcrPeriod
PcrEveryPesPacket
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 M2tsPcrControl
impl M2tsPcrControl
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 M2tsPcrControl
impl AsRef<str> for M2tsPcrControl
source§impl Clone for M2tsPcrControl
impl Clone for M2tsPcrControl
source§fn clone(&self) -> M2tsPcrControl
fn clone(&self) -> M2tsPcrControl
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for M2tsPcrControl
impl Debug for M2tsPcrControl
source§impl Display for M2tsPcrControl
impl Display for M2tsPcrControl
source§impl From<&str> for M2tsPcrControl
impl From<&str> for M2tsPcrControl
source§impl FromStr for M2tsPcrControl
impl FromStr for M2tsPcrControl
source§impl Hash for M2tsPcrControl
impl Hash for M2tsPcrControl
source§impl Ord for M2tsPcrControl
impl Ord for M2tsPcrControl
source§fn cmp(&self, other: &M2tsPcrControl) -> Ordering
fn cmp(&self, other: &M2tsPcrControl) -> 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 M2tsPcrControl
impl PartialEq for M2tsPcrControl
source§fn eq(&self, other: &M2tsPcrControl) -> bool
fn eq(&self, other: &M2tsPcrControl) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for M2tsPcrControl
impl PartialOrd for M2tsPcrControl
source§fn partial_cmp(&self, other: &M2tsPcrControl) -> Option<Ordering>
fn partial_cmp(&self, other: &M2tsPcrControl) -> 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 M2tsPcrControl
impl StructuralPartialEq for M2tsPcrControl
Auto Trait Implementations§
impl Freeze for M2tsPcrControl
impl RefUnwindSafe for M2tsPcrControl
impl Send for M2tsPcrControl
impl Sync for M2tsPcrControl
impl Unpin for M2tsPcrControl
impl UnwindSafe for M2tsPcrControl
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