Enum aws_sdk_connect::types::ViewType
source · #[non_exhaustive]pub enum ViewType {
AwsManaged,
CustomerManaged,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ViewType
, 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 viewtype = unimplemented!();
match viewtype {
ViewType::AwsManaged => { /* ... */ },
ViewType::CustomerManaged => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when viewtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ViewType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ViewType::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 ViewType::NewFeature
is defined.
Specifically, when viewtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ViewType::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
AwsManaged
CustomerManaged
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl Ord for ViewType
impl Ord for ViewType
source§impl PartialEq for ViewType
impl PartialEq for ViewType
source§impl PartialOrd for ViewType
impl PartialOrd for ViewType
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 ViewType
impl StructuralEq for ViewType
impl StructuralPartialEq for ViewType
Auto Trait Implementations§
impl RefUnwindSafe for ViewType
impl Send for ViewType
impl Sync for ViewType
impl Unpin for ViewType
impl UnwindSafe for ViewType
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
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.