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