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