#[non_exhaustive]pub enum Vp8QualityTuningLevel {
MultiPass,
MultiPassHq,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Vp8QualityTuningLevel
, 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 vp8qualitytuninglevel = unimplemented!();
match vp8qualitytuninglevel {
Vp8QualityTuningLevel::MultiPass => { /* ... */ },
Vp8QualityTuningLevel::MultiPassHq => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when vp8qualitytuninglevel
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Vp8QualityTuningLevel::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Vp8QualityTuningLevel::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 Vp8QualityTuningLevel::NewFeature
is defined.
Specifically, when vp8qualitytuninglevel
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Vp8QualityTuningLevel::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. Optional. Use Quality tuning level to choose how you want to trade off encoding speed for output video quality. The default behavior is faster, lower quality, multi-pass encoding.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
MultiPass
MultiPassHq
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 Vp8QualityTuningLevel
impl Vp8QualityTuningLevel
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 Vp8QualityTuningLevel
impl AsRef<str> for Vp8QualityTuningLevel
source§impl Clone for Vp8QualityTuningLevel
impl Clone for Vp8QualityTuningLevel
source§fn clone(&self) -> Vp8QualityTuningLevel
fn clone(&self) -> Vp8QualityTuningLevel
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Vp8QualityTuningLevel
impl Debug for Vp8QualityTuningLevel
source§impl Display for Vp8QualityTuningLevel
impl Display for Vp8QualityTuningLevel
source§impl From<&str> for Vp8QualityTuningLevel
impl From<&str> for Vp8QualityTuningLevel
source§impl FromStr for Vp8QualityTuningLevel
impl FromStr for Vp8QualityTuningLevel
source§impl Hash for Vp8QualityTuningLevel
impl Hash for Vp8QualityTuningLevel
source§impl Ord for Vp8QualityTuningLevel
impl Ord for Vp8QualityTuningLevel
source§fn cmp(&self, other: &Vp8QualityTuningLevel) -> Ordering
fn cmp(&self, other: &Vp8QualityTuningLevel) -> 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 Vp8QualityTuningLevel
impl PartialEq for Vp8QualityTuningLevel
source§fn eq(&self, other: &Vp8QualityTuningLevel) -> bool
fn eq(&self, other: &Vp8QualityTuningLevel) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Vp8QualityTuningLevel
impl PartialOrd for Vp8QualityTuningLevel
source§fn partial_cmp(&self, other: &Vp8QualityTuningLevel) -> Option<Ordering>
fn partial_cmp(&self, other: &Vp8QualityTuningLevel) -> 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 Vp8QualityTuningLevel
impl StructuralPartialEq for Vp8QualityTuningLevel
Auto Trait Implementations§
impl Freeze for Vp8QualityTuningLevel
impl RefUnwindSafe for Vp8QualityTuningLevel
impl Send for Vp8QualityTuningLevel
impl Sync for Vp8QualityTuningLevel
impl Unpin for Vp8QualityTuningLevel
impl UnwindSafe for Vp8QualityTuningLevel
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