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