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