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