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