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