#[non_exhaustive]pub enum BurninSubtitleTeletextSpacing {
Auto,
FixedGrid,
Proportional,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against BurninSubtitleTeletextSpacing
, 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 burninsubtitleteletextspacing = unimplemented!();
match burninsubtitleteletextspacing {
BurninSubtitleTeletextSpacing::Auto => { /* ... */ },
BurninSubtitleTeletextSpacing::FixedGrid => { /* ... */ },
BurninSubtitleTeletextSpacing::Proportional => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when burninsubtitleteletextspacing
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant BurninSubtitleTeletextSpacing::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
BurninSubtitleTeletextSpacing::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 BurninSubtitleTeletextSpacing::NewFeature
is defined.
Specifically, when burninsubtitleteletextspacing
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on BurninSubtitleTeletextSpacing::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 whether the text spacing in your captions is set by the captions grid, or varies depending on letter width. Choose fixed grid to conform to the spacing specified in the captions file more accurately. Choose proportional to make the text easier to read for closed captions.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Auto
FixedGrid
Proportional
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 BurninSubtitleTeletextSpacing
impl BurninSubtitleTeletextSpacing
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 BurninSubtitleTeletextSpacing
impl AsRef<str> for BurninSubtitleTeletextSpacing
source§impl Clone for BurninSubtitleTeletextSpacing
impl Clone for BurninSubtitleTeletextSpacing
source§fn clone(&self) -> BurninSubtitleTeletextSpacing
fn clone(&self) -> BurninSubtitleTeletextSpacing
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl From<&str> for BurninSubtitleTeletextSpacing
impl From<&str> for BurninSubtitleTeletextSpacing
source§impl Hash for BurninSubtitleTeletextSpacing
impl Hash for BurninSubtitleTeletextSpacing
source§impl Ord for BurninSubtitleTeletextSpacing
impl Ord for BurninSubtitleTeletextSpacing
source§fn cmp(&self, other: &BurninSubtitleTeletextSpacing) -> Ordering
fn cmp(&self, other: &BurninSubtitleTeletextSpacing) -> 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 BurninSubtitleTeletextSpacing
impl PartialEq for BurninSubtitleTeletextSpacing
source§fn eq(&self, other: &BurninSubtitleTeletextSpacing) -> bool
fn eq(&self, other: &BurninSubtitleTeletextSpacing) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for BurninSubtitleTeletextSpacing
impl PartialOrd for BurninSubtitleTeletextSpacing
source§fn partial_cmp(&self, other: &BurninSubtitleTeletextSpacing) -> Option<Ordering>
fn partial_cmp(&self, other: &BurninSubtitleTeletextSpacing) -> 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 BurninSubtitleTeletextSpacing
impl StructuralPartialEq for BurninSubtitleTeletextSpacing
Auto Trait Implementations§
impl Freeze for BurninSubtitleTeletextSpacing
impl RefUnwindSafe for BurninSubtitleTeletextSpacing
impl Send for BurninSubtitleTeletextSpacing
impl Sync for BurninSubtitleTeletextSpacing
impl Unpin for BurninSubtitleTeletextSpacing
impl UnwindSafe for BurninSubtitleTeletextSpacing
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