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