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