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