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