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