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