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