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