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