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