#[non_exhaustive]pub enum MpdKlvMetadata {
None,
Passthrough,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MpdKlvMetadata
, 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 mpdklvmetadata = unimplemented!();
match mpdklvmetadata {
MpdKlvMetadata::None => { /* ... */ },
MpdKlvMetadata::Passthrough => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mpdklvmetadata
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MpdKlvMetadata::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MpdKlvMetadata::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 MpdKlvMetadata::NewFeature
is defined.
Specifically, when mpdklvmetadata
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MpdKlvMetadata::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. To include key-length-value metadata in this output: Set KLV metadata insertion to Passthrough. MediaConvert reads KLV metadata present in your input and writes each instance to a separate event message box in the output, according to MISB ST1910.1. To exclude this KLV metadata: Set KLV metadata insertion to None or leave blank.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
None
Passthrough
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 MpdKlvMetadata
impl MpdKlvMetadata
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 MpdKlvMetadata
impl AsRef<str> for MpdKlvMetadata
source§impl Clone for MpdKlvMetadata
impl Clone for MpdKlvMetadata
source§fn clone(&self) -> MpdKlvMetadata
fn clone(&self) -> MpdKlvMetadata
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for MpdKlvMetadata
impl Debug for MpdKlvMetadata
source§impl Display for MpdKlvMetadata
impl Display for MpdKlvMetadata
source§impl From<&str> for MpdKlvMetadata
impl From<&str> for MpdKlvMetadata
source§impl FromStr for MpdKlvMetadata
impl FromStr for MpdKlvMetadata
source§impl Hash for MpdKlvMetadata
impl Hash for MpdKlvMetadata
source§impl Ord for MpdKlvMetadata
impl Ord for MpdKlvMetadata
source§fn cmp(&self, other: &MpdKlvMetadata) -> Ordering
fn cmp(&self, other: &MpdKlvMetadata) -> 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 MpdKlvMetadata
impl PartialEq for MpdKlvMetadata
source§fn eq(&self, other: &MpdKlvMetadata) -> bool
fn eq(&self, other: &MpdKlvMetadata) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for MpdKlvMetadata
impl PartialOrd for MpdKlvMetadata
source§fn partial_cmp(&self, other: &MpdKlvMetadata) -> Option<Ordering>
fn partial_cmp(&self, other: &MpdKlvMetadata) -> 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 MpdKlvMetadata
impl StructuralPartialEq for MpdKlvMetadata
Auto Trait Implementations§
impl Freeze for MpdKlvMetadata
impl RefUnwindSafe for MpdKlvMetadata
impl Send for MpdKlvMetadata
impl Sync for MpdKlvMetadata
impl Unpin for MpdKlvMetadata
impl UnwindSafe for MpdKlvMetadata
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