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