Enum aws_sdk_imagebuilder::types::EbsVolumeType
source · #[non_exhaustive]pub enum EbsVolumeType {
Gp2,
Gp3,
Io1,
Io2,
Sc1,
St1,
Standard,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against EbsVolumeType
, 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 ebsvolumetype = unimplemented!();
match ebsvolumetype {
EbsVolumeType::Gp2 => { /* ... */ },
EbsVolumeType::Gp3 => { /* ... */ },
EbsVolumeType::Io1 => { /* ... */ },
EbsVolumeType::Io2 => { /* ... */ },
EbsVolumeType::Sc1 => { /* ... */ },
EbsVolumeType::St1 => { /* ... */ },
EbsVolumeType::Standard => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when ebsvolumetype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EbsVolumeType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
EbsVolumeType::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 EbsVolumeType::NewFeature
is defined.
Specifically, when ebsvolumetype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on EbsVolumeType::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
Gp2
Gp3
Io1
Io2
Sc1
St1
Standard
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 EbsVolumeType
impl EbsVolumeType
source§impl EbsVolumeType
impl EbsVolumeType
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 EbsVolumeType
impl AsRef<str> for EbsVolumeType
source§impl Clone for EbsVolumeType
impl Clone for EbsVolumeType
source§fn clone(&self) -> EbsVolumeType
fn clone(&self) -> EbsVolumeType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for EbsVolumeType
impl Debug for EbsVolumeType
source§impl Display for EbsVolumeType
impl Display for EbsVolumeType
source§impl From<&str> for EbsVolumeType
impl From<&str> for EbsVolumeType
source§impl FromStr for EbsVolumeType
impl FromStr for EbsVolumeType
source§impl Hash for EbsVolumeType
impl Hash for EbsVolumeType
source§impl Ord for EbsVolumeType
impl Ord for EbsVolumeType
source§fn cmp(&self, other: &EbsVolumeType) -> Ordering
fn cmp(&self, other: &EbsVolumeType) -> 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 EbsVolumeType
impl PartialEq for EbsVolumeType
source§fn eq(&self, other: &EbsVolumeType) -> bool
fn eq(&self, other: &EbsVolumeType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for EbsVolumeType
impl PartialOrd for EbsVolumeType
source§fn partial_cmp(&self, other: &EbsVolumeType) -> Option<Ordering>
fn partial_cmp(&self, other: &EbsVolumeType) -> 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 EbsVolumeType
impl StructuralPartialEq for EbsVolumeType
Auto Trait Implementations§
impl Freeze for EbsVolumeType
impl RefUnwindSafe for EbsVolumeType
impl Send for EbsVolumeType
impl Sync for EbsVolumeType
impl Unpin for EbsVolumeType
impl UnwindSafe for EbsVolumeType
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