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