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