#[non_exhaustive]pub enum ArtifactStoreType {
S3,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ArtifactStoreType
, 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 artifactstoretype = unimplemented!();
match artifactstoretype {
ArtifactStoreType::S3 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when artifactstoretype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ArtifactStoreType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ArtifactStoreType::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 ArtifactStoreType::NewFeature
is defined.
Specifically, when artifactstoretype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ArtifactStoreType::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
S3
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for ArtifactStoreType
impl AsRef<str> for ArtifactStoreType
source§impl Clone for ArtifactStoreType
impl Clone for ArtifactStoreType
source§fn clone(&self) -> ArtifactStoreType
fn clone(&self) -> ArtifactStoreType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ArtifactStoreType
impl Debug for ArtifactStoreType
source§impl From<&str> for ArtifactStoreType
impl From<&str> for ArtifactStoreType
source§impl FromStr for ArtifactStoreType
impl FromStr for ArtifactStoreType
source§impl Hash for ArtifactStoreType
impl Hash for ArtifactStoreType
source§impl Ord for ArtifactStoreType
impl Ord for ArtifactStoreType
source§fn cmp(&self, other: &ArtifactStoreType) -> Ordering
fn cmp(&self, other: &ArtifactStoreType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<ArtifactStoreType> for ArtifactStoreType
impl PartialEq<ArtifactStoreType> for ArtifactStoreType
source§fn eq(&self, other: &ArtifactStoreType) -> bool
fn eq(&self, other: &ArtifactStoreType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<ArtifactStoreType> for ArtifactStoreType
impl PartialOrd<ArtifactStoreType> for ArtifactStoreType
source§fn partial_cmp(&self, other: &ArtifactStoreType) -> Option<Ordering>
fn partial_cmp(&self, other: &ArtifactStoreType) -> 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 ArtifactStoreType
impl StructuralEq for ArtifactStoreType
impl StructuralPartialEq for ArtifactStoreType
Auto Trait Implementations§
impl RefUnwindSafe for ArtifactStoreType
impl Send for ArtifactStoreType
impl Sync for ArtifactStoreType
impl Unpin for ArtifactStoreType
impl UnwindSafe for ArtifactStoreType
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.