#[non_exhaustive]pub enum ProcessingS3DataType {
ManifestFile,
S3Prefix,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ProcessingS3DataType
, 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 processings3datatype = unimplemented!();
match processings3datatype {
ProcessingS3DataType::ManifestFile => { /* ... */ },
ProcessingS3DataType::S3Prefix => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when processings3datatype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ProcessingS3DataType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ProcessingS3DataType::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 ProcessingS3DataType::NewFeature
is defined.
Specifically, when processings3datatype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ProcessingS3DataType::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
ManifestFile
S3Prefix
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 ProcessingS3DataType
impl ProcessingS3DataType
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 ProcessingS3DataType
impl AsRef<str> for ProcessingS3DataType
source§impl Clone for ProcessingS3DataType
impl Clone for ProcessingS3DataType
source§fn clone(&self) -> ProcessingS3DataType
fn clone(&self) -> ProcessingS3DataType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ProcessingS3DataType
impl Debug for ProcessingS3DataType
source§impl Display for ProcessingS3DataType
impl Display for ProcessingS3DataType
source§impl From<&str> for ProcessingS3DataType
impl From<&str> for ProcessingS3DataType
source§impl FromStr for ProcessingS3DataType
impl FromStr for ProcessingS3DataType
source§impl Hash for ProcessingS3DataType
impl Hash for ProcessingS3DataType
source§impl Ord for ProcessingS3DataType
impl Ord for ProcessingS3DataType
source§fn cmp(&self, other: &ProcessingS3DataType) -> Ordering
fn cmp(&self, other: &ProcessingS3DataType) -> 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 ProcessingS3DataType
impl PartialEq for ProcessingS3DataType
source§impl PartialOrd for ProcessingS3DataType
impl PartialOrd for ProcessingS3DataType
impl Eq for ProcessingS3DataType
impl StructuralPartialEq for ProcessingS3DataType
Auto Trait Implementations§
impl Freeze for ProcessingS3DataType
impl RefUnwindSafe for ProcessingS3DataType
impl Send for ProcessingS3DataType
impl Sync for ProcessingS3DataType
impl Unpin for ProcessingS3DataType
impl UnwindSafe for ProcessingS3DataType
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)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