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