#[non_exhaustive]pub enum Mp4FreeSpaceBox {
Exclude,
Include,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Mp4FreeSpaceBox
, 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 mp4freespacebox = unimplemented!();
match mp4freespacebox {
Mp4FreeSpaceBox::Exclude => { /* ... */ },
Mp4FreeSpaceBox::Include => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mp4freespacebox
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Mp4FreeSpaceBox::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Mp4FreeSpaceBox::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 Mp4FreeSpaceBox::NewFeature
is defined.
Specifically, when mp4freespacebox
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Mp4FreeSpaceBox::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. Inserts a free-space box immediately after the moov box.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Exclude
Include
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 Mp4FreeSpaceBox
impl Mp4FreeSpaceBox
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 Mp4FreeSpaceBox
impl AsRef<str> for Mp4FreeSpaceBox
source§impl Clone for Mp4FreeSpaceBox
impl Clone for Mp4FreeSpaceBox
source§fn clone(&self) -> Mp4FreeSpaceBox
fn clone(&self) -> Mp4FreeSpaceBox
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Mp4FreeSpaceBox
impl Debug for Mp4FreeSpaceBox
source§impl Display for Mp4FreeSpaceBox
impl Display for Mp4FreeSpaceBox
source§impl From<&str> for Mp4FreeSpaceBox
impl From<&str> for Mp4FreeSpaceBox
source§impl FromStr for Mp4FreeSpaceBox
impl FromStr for Mp4FreeSpaceBox
source§impl Hash for Mp4FreeSpaceBox
impl Hash for Mp4FreeSpaceBox
source§impl Ord for Mp4FreeSpaceBox
impl Ord for Mp4FreeSpaceBox
source§fn cmp(&self, other: &Mp4FreeSpaceBox) -> Ordering
fn cmp(&self, other: &Mp4FreeSpaceBox) -> 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 Mp4FreeSpaceBox
impl PartialEq for Mp4FreeSpaceBox
source§fn eq(&self, other: &Mp4FreeSpaceBox) -> bool
fn eq(&self, other: &Mp4FreeSpaceBox) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Mp4FreeSpaceBox
impl PartialOrd for Mp4FreeSpaceBox
source§fn partial_cmp(&self, other: &Mp4FreeSpaceBox) -> Option<Ordering>
fn partial_cmp(&self, other: &Mp4FreeSpaceBox) -> 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 Mp4FreeSpaceBox
impl StructuralPartialEq for Mp4FreeSpaceBox
Auto Trait Implementations§
impl Freeze for Mp4FreeSpaceBox
impl RefUnwindSafe for Mp4FreeSpaceBox
impl Send for Mp4FreeSpaceBox
impl Sync for Mp4FreeSpaceBox
impl Unpin for Mp4FreeSpaceBox
impl UnwindSafe for Mp4FreeSpaceBox
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