#[non_exhaustive]pub enum ImportTaskStatus {
Complete,
Deleting,
Failed,
Initialized,
Initializing,
Pending,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ImportTaskStatus
, 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 importtaskstatus = unimplemented!();
match importtaskstatus {
ImportTaskStatus::Complete => { /* ... */ },
ImportTaskStatus::Deleting => { /* ... */ },
ImportTaskStatus::Failed => { /* ... */ },
ImportTaskStatus::Initialized => { /* ... */ },
ImportTaskStatus::Initializing => { /* ... */ },
ImportTaskStatus::Pending => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when importtaskstatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ImportTaskStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ImportTaskStatus::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 ImportTaskStatus::NewFeature
is defined.
Specifically, when importtaskstatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ImportTaskStatus::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
Complete
Deleting
Failed
Initialized
Initializing
Pending
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 ImportTaskStatus
impl ImportTaskStatus
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 ImportTaskStatus
impl AsRef<str> for ImportTaskStatus
source§impl Clone for ImportTaskStatus
impl Clone for ImportTaskStatus
source§fn clone(&self) -> ImportTaskStatus
fn clone(&self) -> ImportTaskStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ImportTaskStatus
impl Debug for ImportTaskStatus
source§impl Display for ImportTaskStatus
impl Display for ImportTaskStatus
source§impl From<&str> for ImportTaskStatus
impl From<&str> for ImportTaskStatus
source§impl FromStr for ImportTaskStatus
impl FromStr for ImportTaskStatus
source§impl Hash for ImportTaskStatus
impl Hash for ImportTaskStatus
source§impl Ord for ImportTaskStatus
impl Ord for ImportTaskStatus
source§fn cmp(&self, other: &ImportTaskStatus) -> Ordering
fn cmp(&self, other: &ImportTaskStatus) -> 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 ImportTaskStatus
impl PartialEq for ImportTaskStatus
source§fn eq(&self, other: &ImportTaskStatus) -> bool
fn eq(&self, other: &ImportTaskStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ImportTaskStatus
impl PartialOrd for ImportTaskStatus
source§fn partial_cmp(&self, other: &ImportTaskStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &ImportTaskStatus) -> 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 ImportTaskStatus
impl StructuralPartialEq for ImportTaskStatus
Auto Trait Implementations§
impl Freeze for ImportTaskStatus
impl RefUnwindSafe for ImportTaskStatus
impl Send for ImportTaskStatus
impl Sync for ImportTaskStatus
impl Unpin for ImportTaskStatus
impl UnwindSafe for ImportTaskStatus
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.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more