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