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