#[non_exhaustive]
pub enum ContainerFormat {
FragmentedMp4,
MpegTs,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ContainerFormat
, 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 containerformat = unimplemented!();
match containerformat {
ContainerFormat::FragmentedMp4 => { /* ... */ },
ContainerFormat::MpegTs => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when containerformat
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ContainerFormat::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ContainerFormat::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 ContainerFormat::NewFeature
is defined.
Specifically, when containerformat
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ContainerFormat::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.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
FragmentedMp4
MpegTs
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for ContainerFormat
impl AsRef<str> for ContainerFormat
source§impl Clone for ContainerFormat
impl Clone for ContainerFormat
source§fn clone(&self) -> ContainerFormat
fn clone(&self) -> ContainerFormat
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ContainerFormat
impl Debug for ContainerFormat
source§impl From<&str> for ContainerFormat
impl From<&str> for ContainerFormat
source§impl FromStr for ContainerFormat
impl FromStr for ContainerFormat
source§impl Hash for ContainerFormat
impl Hash for ContainerFormat
source§impl Ord for ContainerFormat
impl Ord for ContainerFormat
source§fn cmp(&self, other: &ContainerFormat) -> Ordering
fn cmp(&self, other: &ContainerFormat) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<ContainerFormat> for ContainerFormat
impl PartialEq<ContainerFormat> for ContainerFormat
source§fn eq(&self, other: &ContainerFormat) -> bool
fn eq(&self, other: &ContainerFormat) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<ContainerFormat> for ContainerFormat
impl PartialOrd<ContainerFormat> for ContainerFormat
source§fn partial_cmp(&self, other: &ContainerFormat) -> Option<Ordering>
fn partial_cmp(&self, other: &ContainerFormat) -> 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 ContainerFormat
impl StructuralEq for ContainerFormat
impl StructuralPartialEq for ContainerFormat
Auto Trait Implementations§
impl RefUnwindSafe for ContainerFormat
impl Send for ContainerFormat
impl Sync for ContainerFormat
impl Unpin for ContainerFormat
impl UnwindSafe for ContainerFormat
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.