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