#[non_exhaustive]pub enum DetailedStatus {
ConfigurationComplete,
ValidationFailed,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DetailedStatus
, 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 detailedstatus = unimplemented!();
match detailedstatus {
DetailedStatus::ConfigurationComplete => { /* ... */ },
DetailedStatus::ValidationFailed => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when detailedstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DetailedStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DetailedStatus::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 DetailedStatus::NewFeature
is defined.
Specifically, when detailedstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DetailedStatus::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
ConfigurationComplete
ValidationFailed
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 DetailedStatus
impl DetailedStatus
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 DetailedStatus
impl AsRef<str> for DetailedStatus
source§impl Clone for DetailedStatus
impl Clone for DetailedStatus
source§fn clone(&self) -> DetailedStatus
fn clone(&self) -> DetailedStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DetailedStatus
impl Debug for DetailedStatus
source§impl Display for DetailedStatus
impl Display for DetailedStatus
source§impl From<&str> for DetailedStatus
impl From<&str> for DetailedStatus
source§impl FromStr for DetailedStatus
impl FromStr for DetailedStatus
source§impl Hash for DetailedStatus
impl Hash for DetailedStatus
source§impl Ord for DetailedStatus
impl Ord for DetailedStatus
source§fn cmp(&self, other: &DetailedStatus) -> Ordering
fn cmp(&self, other: &DetailedStatus) -> 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 DetailedStatus
impl PartialEq for DetailedStatus
source§fn eq(&self, other: &DetailedStatus) -> bool
fn eq(&self, other: &DetailedStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DetailedStatus
impl PartialOrd for DetailedStatus
source§fn partial_cmp(&self, other: &DetailedStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &DetailedStatus) -> 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 DetailedStatus
impl StructuralPartialEq for DetailedStatus
Auto Trait Implementations§
impl Freeze for DetailedStatus
impl RefUnwindSafe for DetailedStatus
impl Send for DetailedStatus
impl Sync for DetailedStatus
impl Unpin for DetailedStatus
impl UnwindSafe for DetailedStatus
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> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.