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