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