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