#[non_exhaustive]pub enum DashIsoHbbtvCompliance {
Hbbtv15,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DashIsoHbbtvCompliance
, 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 dashisohbbtvcompliance = unimplemented!();
match dashisohbbtvcompliance {
DashIsoHbbtvCompliance::Hbbtv15 => { /* ... */ },
DashIsoHbbtvCompliance::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dashisohbbtvcompliance
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DashIsoHbbtvCompliance::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DashIsoHbbtvCompliance::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 DashIsoHbbtvCompliance::NewFeature
is defined.
Specifically, when dashisohbbtvcompliance
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DashIsoHbbtvCompliance::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. Supports HbbTV specification as indicated
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Hbbtv15
None
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 DashIsoHbbtvCompliance
impl DashIsoHbbtvCompliance
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 DashIsoHbbtvCompliance
impl AsRef<str> for DashIsoHbbtvCompliance
source§impl Clone for DashIsoHbbtvCompliance
impl Clone for DashIsoHbbtvCompliance
source§fn clone(&self) -> DashIsoHbbtvCompliance
fn clone(&self) -> DashIsoHbbtvCompliance
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DashIsoHbbtvCompliance
impl Debug for DashIsoHbbtvCompliance
source§impl Display for DashIsoHbbtvCompliance
impl Display for DashIsoHbbtvCompliance
source§impl From<&str> for DashIsoHbbtvCompliance
impl From<&str> for DashIsoHbbtvCompliance
source§impl FromStr for DashIsoHbbtvCompliance
impl FromStr for DashIsoHbbtvCompliance
source§impl Hash for DashIsoHbbtvCompliance
impl Hash for DashIsoHbbtvCompliance
source§impl Ord for DashIsoHbbtvCompliance
impl Ord for DashIsoHbbtvCompliance
source§fn cmp(&self, other: &DashIsoHbbtvCompliance) -> Ordering
fn cmp(&self, other: &DashIsoHbbtvCompliance) -> 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 DashIsoHbbtvCompliance
impl PartialEq for DashIsoHbbtvCompliance
source§fn eq(&self, other: &DashIsoHbbtvCompliance) -> bool
fn eq(&self, other: &DashIsoHbbtvCompliance) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DashIsoHbbtvCompliance
impl PartialOrd for DashIsoHbbtvCompliance
source§fn partial_cmp(&self, other: &DashIsoHbbtvCompliance) -> Option<Ordering>
fn partial_cmp(&self, other: &DashIsoHbbtvCompliance) -> 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 DashIsoHbbtvCompliance
impl StructuralPartialEq for DashIsoHbbtvCompliance
Auto Trait Implementations§
impl Freeze for DashIsoHbbtvCompliance
impl RefUnwindSafe for DashIsoHbbtvCompliance
impl Send for DashIsoHbbtvCompliance
impl Sync for DashIsoHbbtvCompliance
impl Unpin for DashIsoHbbtvCompliance
impl UnwindSafe for DashIsoHbbtvCompliance
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