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