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