#[non_exhaustive]pub enum OverwriteChildResourcePermissionsWithDefaultEnum {
Accept,
Deny,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against OverwriteChildResourcePermissionsWithDefaultEnum, 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 overwritechildresourcepermissionswithdefaultenum = unimplemented!();
match overwritechildresourcepermissionswithdefaultenum {
OverwriteChildResourcePermissionsWithDefaultEnum::Accept => { /* ... */ },
OverwriteChildResourcePermissionsWithDefaultEnum::Deny => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}The above code demonstrates that when overwritechildresourcepermissionswithdefaultenum represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant OverwriteChildResourcePermissionsWithDefaultEnum::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
OverwriteChildResourcePermissionsWithDefaultEnum::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 OverwriteChildResourcePermissionsWithDefaultEnum::NewFeature is defined.
Specifically, when overwritechildresourcepermissionswithdefaultenum represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on OverwriteChildResourcePermissionsWithDefaultEnum::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
Accept
Deny
Unknown(UnknownVariantValue)
Don’t directly match on 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 OverwriteChildResourcePermissionsWithDefaultEnum
impl OverwriteChildResourcePermissionsWithDefaultEnum
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 Clone for OverwriteChildResourcePermissionsWithDefaultEnum
impl Clone for OverwriteChildResourcePermissionsWithDefaultEnum
Source§fn clone(&self) -> OverwriteChildResourcePermissionsWithDefaultEnum
fn clone(&self) -> OverwriteChildResourcePermissionsWithDefaultEnum
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreSource§impl Ord for OverwriteChildResourcePermissionsWithDefaultEnum
impl Ord for OverwriteChildResourcePermissionsWithDefaultEnum
Source§fn cmp(
&self,
other: &OverwriteChildResourcePermissionsWithDefaultEnum,
) -> Ordering
fn cmp( &self, other: &OverwriteChildResourcePermissionsWithDefaultEnum, ) -> Ordering
1.21.0 (const: unstable) · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl PartialEq for OverwriteChildResourcePermissionsWithDefaultEnum
impl PartialEq for OverwriteChildResourcePermissionsWithDefaultEnum
Source§fn eq(&self, other: &OverwriteChildResourcePermissionsWithDefaultEnum) -> bool
fn eq(&self, other: &OverwriteChildResourcePermissionsWithDefaultEnum) -> bool
self and other values to be equal, and is used by ==.Source§impl PartialOrd for OverwriteChildResourcePermissionsWithDefaultEnum
impl PartialOrd for OverwriteChildResourcePermissionsWithDefaultEnum
Source§fn partial_cmp(
&self,
other: &OverwriteChildResourcePermissionsWithDefaultEnum,
) -> Option<Ordering>
fn partial_cmp( &self, other: &OverwriteChildResourcePermissionsWithDefaultEnum, ) -> Option<Ordering>
impl Eq for OverwriteChildResourcePermissionsWithDefaultEnum
impl StructuralPartialEq for OverwriteChildResourcePermissionsWithDefaultEnum
Auto Trait Implementations§
impl Freeze for OverwriteChildResourcePermissionsWithDefaultEnum
impl RefUnwindSafe for OverwriteChildResourcePermissionsWithDefaultEnum
impl Send for OverwriteChildResourcePermissionsWithDefaultEnum
impl Sync for OverwriteChildResourcePermissionsWithDefaultEnum
impl Unpin for OverwriteChildResourcePermissionsWithDefaultEnum
impl UnsafeUnpin for OverwriteChildResourcePermissionsWithDefaultEnum
impl UnwindSafe for OverwriteChildResourcePermissionsWithDefaultEnum
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§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§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