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