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