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