#[non_exhaustive]
pub enum FrameOptionsList {
Deny,
Sameorigin,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against FrameOptionsList
, 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 frameoptionslist = unimplemented!();
match frameoptionslist {
FrameOptionsList::Deny => { /* ... */ },
FrameOptionsList::Sameorigin => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when frameoptionslist
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant FrameOptionsList::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
FrameOptionsList::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 FrameOptionsList::NewFeature
is defined.
Specifically, when frameoptionslist
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on FrameOptionsList::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
Deny
Sameorigin
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for FrameOptionsList
impl AsRef<str> for FrameOptionsList
source§impl Clone for FrameOptionsList
impl Clone for FrameOptionsList
source§fn clone(&self) -> FrameOptionsList
fn clone(&self) -> FrameOptionsList
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for FrameOptionsList
impl Debug for FrameOptionsList
source§impl From<&str> for FrameOptionsList
impl From<&str> for FrameOptionsList
source§impl FromStr for FrameOptionsList
impl FromStr for FrameOptionsList
source§impl Hash for FrameOptionsList
impl Hash for FrameOptionsList
source§impl Ord for FrameOptionsList
impl Ord for FrameOptionsList
source§fn cmp(&self, other: &FrameOptionsList) -> Ordering
fn cmp(&self, other: &FrameOptionsList) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<FrameOptionsList> for FrameOptionsList
impl PartialEq<FrameOptionsList> for FrameOptionsList
source§fn eq(&self, other: &FrameOptionsList) -> bool
fn eq(&self, other: &FrameOptionsList) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<FrameOptionsList> for FrameOptionsList
impl PartialOrd<FrameOptionsList> for FrameOptionsList
source§fn partial_cmp(&self, other: &FrameOptionsList) -> Option<Ordering>
fn partial_cmp(&self, other: &FrameOptionsList) -> 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 FrameOptionsList
impl StructuralEq for FrameOptionsList
impl StructuralPartialEq for FrameOptionsList
Auto Trait Implementations§
impl RefUnwindSafe for FrameOptionsList
impl Send for FrameOptionsList
impl Sync for FrameOptionsList
impl Unpin for FrameOptionsList
impl UnwindSafe for FrameOptionsList
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.