Enum aws_sdk_connect::types::QueueType
source · #[non_exhaustive]
pub enum QueueType {
Agent,
Standard,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against QueueType
, 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 queuetype = unimplemented!();
match queuetype {
QueueType::Agent => { /* ... */ },
QueueType::Standard => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when queuetype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant QueueType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
QueueType::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 QueueType::NewFeature
is defined.
Specifically, when queuetype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on QueueType::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
Agent
Standard
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl Ord for QueueType
impl Ord for QueueType
source§impl PartialEq<QueueType> for QueueType
impl PartialEq<QueueType> for QueueType
source§impl PartialOrd<QueueType> for QueueType
impl PartialOrd<QueueType> for QueueType
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 QueueType
impl StructuralEq for QueueType
impl StructuralPartialEq for QueueType
Auto Trait Implementations§
impl RefUnwindSafe for QueueType
impl Send for QueueType
impl Sync for QueueType
impl Unpin for QueueType
impl UnwindSafe for QueueType
Blanket Implementations§
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.