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