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