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