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