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