Enum aws_sdk_networkmanager::types::SiteState
source · #[non_exhaustive]pub enum SiteState {
Available,
Deleting,
Pending,
Updating,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against SiteState
, 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 sitestate = unimplemented!();
match sitestate {
SiteState::Available => { /* ... */ },
SiteState::Deleting => { /* ... */ },
SiteState::Pending => { /* ... */ },
SiteState::Updating => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when sitestate
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant SiteState::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
SiteState::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 SiteState::NewFeature
is defined.
Specifically, when sitestate
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on SiteState::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§
Trait Implementations§
source§impl Ord for SiteState
impl Ord for SiteState
source§impl PartialEq for SiteState
impl PartialEq for SiteState
source§impl PartialOrd for SiteState
impl PartialOrd for SiteState
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 SiteState
impl StructuralPartialEq for SiteState
Auto Trait Implementations§
impl Freeze for SiteState
impl RefUnwindSafe for SiteState
impl Send for SiteState
impl Sync for SiteState
impl Unpin for SiteState
impl UnwindSafe for SiteState
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.