#[non_exhaustive]pub enum ArtifactNamespace {
BuildId,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ArtifactNamespace
, 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 artifactnamespace = unimplemented!();
match artifactnamespace {
ArtifactNamespace::BuildId => { /* ... */ },
ArtifactNamespace::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when artifactnamespace
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ArtifactNamespace::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ArtifactNamespace::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 ArtifactNamespace::NewFeature
is defined.
Specifically, when artifactnamespace
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ArtifactNamespace::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
BuildId
None
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§
source§impl ArtifactNamespace
impl ArtifactNamespace
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for ArtifactNamespace
impl AsRef<str> for ArtifactNamespace
source§impl Clone for ArtifactNamespace
impl Clone for ArtifactNamespace
source§fn clone(&self) -> ArtifactNamespace
fn clone(&self) -> ArtifactNamespace
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ArtifactNamespace
impl Debug for ArtifactNamespace
source§impl From<&str> for ArtifactNamespace
impl From<&str> for ArtifactNamespace
source§impl FromStr for ArtifactNamespace
impl FromStr for ArtifactNamespace
source§impl Hash for ArtifactNamespace
impl Hash for ArtifactNamespace
source§impl Ord for ArtifactNamespace
impl Ord for ArtifactNamespace
source§fn cmp(&self, other: &ArtifactNamespace) -> Ordering
fn cmp(&self, other: &ArtifactNamespace) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for ArtifactNamespace
impl PartialEq for ArtifactNamespace
source§fn eq(&self, other: &ArtifactNamespace) -> bool
fn eq(&self, other: &ArtifactNamespace) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ArtifactNamespace
impl PartialOrd for ArtifactNamespace
source§fn partial_cmp(&self, other: &ArtifactNamespace) -> Option<Ordering>
fn partial_cmp(&self, other: &ArtifactNamespace) -> 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 ArtifactNamespace
impl StructuralEq for ArtifactNamespace
impl StructuralPartialEq for ArtifactNamespace
Auto Trait Implementations§
impl RefUnwindSafe for ArtifactNamespace
impl Send for ArtifactNamespace
impl Sync for ArtifactNamespace
impl Unpin for ArtifactNamespace
impl UnwindSafe for ArtifactNamespace
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> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.