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