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