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