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