Enum aws_sdk_ses::types::DsnAction
source · #[non_exhaustive]pub enum DsnAction {
Delayed,
Delivered,
Expanded,
Failed,
Relayed,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DsnAction
, 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 dsnaction = unimplemented!();
match dsnaction {
DsnAction::Delayed => { /* ... */ },
DsnAction::Delivered => { /* ... */ },
DsnAction::Expanded => { /* ... */ },
DsnAction::Failed => { /* ... */ },
DsnAction::Relayed => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when dsnaction
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DsnAction::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DsnAction::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 DsnAction::NewFeature
is defined.
Specifically, when dsnaction
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DsnAction::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
Delayed
Delivered
Expanded
Failed
Relayed
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§
Trait Implementations§
source§impl Ord for DsnAction
impl Ord for DsnAction
source§impl PartialEq for DsnAction
impl PartialEq for DsnAction
source§impl PartialOrd for DsnAction
impl PartialOrd for DsnAction
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 DsnAction
impl StructuralPartialEq for DsnAction
Auto Trait Implementations§
impl Freeze for DsnAction
impl RefUnwindSafe for DsnAction
impl Send for DsnAction
impl Sync for DsnAction
impl Unpin for DsnAction
impl UnwindSafe for DsnAction
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.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more