Enum aws_sdk_wafv2::types::FilterBehavior
source · #[non_exhaustive]pub enum FilterBehavior {
Drop,
Keep,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against FilterBehavior
, 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 filterbehavior = unimplemented!();
match filterbehavior {
FilterBehavior::Drop => { /* ... */ },
FilterBehavior::Keep => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when filterbehavior
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant FilterBehavior::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
FilterBehavior::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 FilterBehavior::NewFeature
is defined.
Specifically, when filterbehavior
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on FilterBehavior::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
Drop
Keep
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 FilterBehavior
impl FilterBehavior
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 FilterBehavior
impl AsRef<str> for FilterBehavior
source§impl Clone for FilterBehavior
impl Clone for FilterBehavior
source§fn clone(&self) -> FilterBehavior
fn clone(&self) -> FilterBehavior
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for FilterBehavior
impl Debug for FilterBehavior
source§impl Display for FilterBehavior
impl Display for FilterBehavior
source§impl From<&str> for FilterBehavior
impl From<&str> for FilterBehavior
source§impl FromStr for FilterBehavior
impl FromStr for FilterBehavior
source§impl Hash for FilterBehavior
impl Hash for FilterBehavior
source§impl Ord for FilterBehavior
impl Ord for FilterBehavior
source§fn cmp(&self, other: &FilterBehavior) -> Ordering
fn cmp(&self, other: &FilterBehavior) -> 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 FilterBehavior
impl PartialEq for FilterBehavior
source§fn eq(&self, other: &FilterBehavior) -> bool
fn eq(&self, other: &FilterBehavior) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for FilterBehavior
impl PartialOrd for FilterBehavior
source§fn partial_cmp(&self, other: &FilterBehavior) -> Option<Ordering>
fn partial_cmp(&self, other: &FilterBehavior) -> 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 FilterBehavior
impl StructuralPartialEq for FilterBehavior
Auto Trait Implementations§
impl Freeze for FilterBehavior
impl RefUnwindSafe for FilterBehavior
impl Send for FilterBehavior
impl Sync for FilterBehavior
impl Unpin for FilterBehavior
impl UnwindSafe for FilterBehavior
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.