#[non_exhaustive]pub enum Vp9RateControlMode {
Vbr,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Vp9RateControlMode
, 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 vp9ratecontrolmode = unimplemented!();
match vp9ratecontrolmode {
Vp9RateControlMode::Vbr => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when vp9ratecontrolmode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Vp9RateControlMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Vp9RateControlMode::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 Vp9RateControlMode::NewFeature
is defined.
Specifically, when vp9ratecontrolmode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Vp9RateControlMode::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. With the VP9 codec, you can use only the variable bitrate (VBR) rate control mode.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Vbr
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 Vp9RateControlMode
impl Vp9RateControlMode
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 Vp9RateControlMode
impl AsRef<str> for Vp9RateControlMode
source§impl Clone for Vp9RateControlMode
impl Clone for Vp9RateControlMode
source§fn clone(&self) -> Vp9RateControlMode
fn clone(&self) -> Vp9RateControlMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Vp9RateControlMode
impl Debug for Vp9RateControlMode
source§impl Display for Vp9RateControlMode
impl Display for Vp9RateControlMode
source§impl From<&str> for Vp9RateControlMode
impl From<&str> for Vp9RateControlMode
source§impl FromStr for Vp9RateControlMode
impl FromStr for Vp9RateControlMode
source§impl Hash for Vp9RateControlMode
impl Hash for Vp9RateControlMode
source§impl Ord for Vp9RateControlMode
impl Ord for Vp9RateControlMode
source§fn cmp(&self, other: &Vp9RateControlMode) -> Ordering
fn cmp(&self, other: &Vp9RateControlMode) -> 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 Vp9RateControlMode
impl PartialEq for Vp9RateControlMode
source§fn eq(&self, other: &Vp9RateControlMode) -> bool
fn eq(&self, other: &Vp9RateControlMode) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Vp9RateControlMode
impl PartialOrd for Vp9RateControlMode
source§fn partial_cmp(&self, other: &Vp9RateControlMode) -> Option<Ordering>
fn partial_cmp(&self, other: &Vp9RateControlMode) -> 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 Vp9RateControlMode
impl StructuralPartialEq for Vp9RateControlMode
Auto Trait Implementations§
impl Freeze for Vp9RateControlMode
impl RefUnwindSafe for Vp9RateControlMode
impl Send for Vp9RateControlMode
impl Sync for Vp9RateControlMode
impl Unpin for Vp9RateControlMode
impl UnwindSafe for Vp9RateControlMode
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