#[non_exhaustive]pub enum Mpeg2GopSizeUnits {
Frames,
Seconds,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Mpeg2GopSizeUnits
, 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 mpeg2gopsizeunits = unimplemented!();
match mpeg2gopsizeunits {
Mpeg2GopSizeUnits::Frames => { /* ... */ },
Mpeg2GopSizeUnits::Seconds => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mpeg2gopsizeunits
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Mpeg2GopSizeUnits::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Mpeg2GopSizeUnits::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 Mpeg2GopSizeUnits::NewFeature
is defined.
Specifically, when mpeg2gopsizeunits
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Mpeg2GopSizeUnits::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 units for GOP size. If you don’t specify a value here, by default the encoder measures GOP size in frames.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Frames
Seconds
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 Mpeg2GopSizeUnits
impl Mpeg2GopSizeUnits
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 Mpeg2GopSizeUnits
impl AsRef<str> for Mpeg2GopSizeUnits
source§impl Clone for Mpeg2GopSizeUnits
impl Clone for Mpeg2GopSizeUnits
source§fn clone(&self) -> Mpeg2GopSizeUnits
fn clone(&self) -> Mpeg2GopSizeUnits
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Mpeg2GopSizeUnits
impl Debug for Mpeg2GopSizeUnits
source§impl Display for Mpeg2GopSizeUnits
impl Display for Mpeg2GopSizeUnits
source§impl From<&str> for Mpeg2GopSizeUnits
impl From<&str> for Mpeg2GopSizeUnits
source§impl FromStr for Mpeg2GopSizeUnits
impl FromStr for Mpeg2GopSizeUnits
source§impl Hash for Mpeg2GopSizeUnits
impl Hash for Mpeg2GopSizeUnits
source§impl Ord for Mpeg2GopSizeUnits
impl Ord for Mpeg2GopSizeUnits
source§fn cmp(&self, other: &Mpeg2GopSizeUnits) -> Ordering
fn cmp(&self, other: &Mpeg2GopSizeUnits) -> 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 Mpeg2GopSizeUnits
impl PartialEq for Mpeg2GopSizeUnits
source§fn eq(&self, other: &Mpeg2GopSizeUnits) -> bool
fn eq(&self, other: &Mpeg2GopSizeUnits) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Mpeg2GopSizeUnits
impl PartialOrd for Mpeg2GopSizeUnits
source§fn partial_cmp(&self, other: &Mpeg2GopSizeUnits) -> Option<Ordering>
fn partial_cmp(&self, other: &Mpeg2GopSizeUnits) -> 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 Mpeg2GopSizeUnits
impl StructuralPartialEq for Mpeg2GopSizeUnits
Auto Trait Implementations§
impl Freeze for Mpeg2GopSizeUnits
impl RefUnwindSafe for Mpeg2GopSizeUnits
impl Send for Mpeg2GopSizeUnits
impl Sync for Mpeg2GopSizeUnits
impl Unpin for Mpeg2GopSizeUnits
impl UnwindSafe for Mpeg2GopSizeUnits
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