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