Enum aws_sdk_route53resolver::types::Validation
source · #[non_exhaustive]pub enum Validation {
Disable,
Enable,
UseLocalResourceSetting,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Validation
, 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 validation = unimplemented!();
match validation {
Validation::Disable => { /* ... */ },
Validation::Enable => { /* ... */ },
Validation::UseLocalResourceSetting => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when validation
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Validation::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Validation::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 Validation::NewFeature
is defined.
Specifically, when validation
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Validation::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
Disable
Enable
UseLocalResourceSetting
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 Validation
impl Validation
source§impl Validation
impl Validation
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 Validation
impl AsRef<str> for Validation
source§impl Clone for Validation
impl Clone for Validation
source§fn clone(&self) -> Validation
fn clone(&self) -> Validation
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Validation
impl Debug for Validation
source§impl Display for Validation
impl Display for Validation
source§impl From<&str> for Validation
impl From<&str> for Validation
source§impl FromStr for Validation
impl FromStr for Validation
source§impl Hash for Validation
impl Hash for Validation
source§impl Ord for Validation
impl Ord for Validation
source§fn cmp(&self, other: &Validation) -> Ordering
fn cmp(&self, other: &Validation) -> 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 Validation
impl PartialEq for Validation
source§fn eq(&self, other: &Validation) -> bool
fn eq(&self, other: &Validation) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for Validation
impl PartialOrd for Validation
source§fn partial_cmp(&self, other: &Validation) -> Option<Ordering>
fn partial_cmp(&self, other: &Validation) -> 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 Validation
impl StructuralPartialEq for Validation
Auto Trait Implementations§
impl Freeze for Validation
impl RefUnwindSafe for Validation
impl Send for Validation
impl Sync for Validation
impl Unpin for Validation
impl UnwindSafe for Validation
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