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