#[non_exhaustive]
pub enum WarmPoolResourceStatus {
Available,
Inuse,
Reused,
Terminated,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against WarmPoolResourceStatus
, 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 warmpoolresourcestatus = unimplemented!();
match warmpoolresourcestatus {
WarmPoolResourceStatus::Available => { /* ... */ },
WarmPoolResourceStatus::Inuse => { /* ... */ },
WarmPoolResourceStatus::Reused => { /* ... */ },
WarmPoolResourceStatus::Terminated => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when warmpoolresourcestatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant WarmPoolResourceStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
WarmPoolResourceStatus::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 WarmPoolResourceStatus::NewFeature
is defined.
Specifically, when warmpoolresourcestatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on WarmPoolResourceStatus::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
Available
Inuse
Reused
Terminated
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for WarmPoolResourceStatus
impl AsRef<str> for WarmPoolResourceStatus
source§impl Clone for WarmPoolResourceStatus
impl Clone for WarmPoolResourceStatus
source§fn clone(&self) -> WarmPoolResourceStatus
fn clone(&self) -> WarmPoolResourceStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for WarmPoolResourceStatus
impl Debug for WarmPoolResourceStatus
source§impl From<&str> for WarmPoolResourceStatus
impl From<&str> for WarmPoolResourceStatus
source§impl FromStr for WarmPoolResourceStatus
impl FromStr for WarmPoolResourceStatus
source§impl Hash for WarmPoolResourceStatus
impl Hash for WarmPoolResourceStatus
source§impl Ord for WarmPoolResourceStatus
impl Ord for WarmPoolResourceStatus
source§fn cmp(&self, other: &WarmPoolResourceStatus) -> Ordering
fn cmp(&self, other: &WarmPoolResourceStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<WarmPoolResourceStatus> for WarmPoolResourceStatus
impl PartialEq<WarmPoolResourceStatus> for WarmPoolResourceStatus
source§fn eq(&self, other: &WarmPoolResourceStatus) -> bool
fn eq(&self, other: &WarmPoolResourceStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<WarmPoolResourceStatus> for WarmPoolResourceStatus
impl PartialOrd<WarmPoolResourceStatus> for WarmPoolResourceStatus
source§fn partial_cmp(&self, other: &WarmPoolResourceStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &WarmPoolResourceStatus) -> 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 WarmPoolResourceStatus
impl StructuralEq for WarmPoolResourceStatus
impl StructuralPartialEq for WarmPoolResourceStatus
Auto Trait Implementations§
impl RefUnwindSafe for WarmPoolResourceStatus
impl Send for WarmPoolResourceStatus
impl Sync for WarmPoolResourceStatus
impl Unpin for WarmPoolResourceStatus
impl UnwindSafe for WarmPoolResourceStatus
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.