Enum aws_sdk_snowball::types::DeviceServiceName
source · #[non_exhaustive]pub enum DeviceServiceName {
NfsOnDeviceService,
S3OnDeviceService,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DeviceServiceName
, 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 deviceservicename = unimplemented!();
match deviceservicename {
DeviceServiceName::NfsOnDeviceService => { /* ... */ },
DeviceServiceName::S3OnDeviceService => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when deviceservicename
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DeviceServiceName::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DeviceServiceName::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 DeviceServiceName::NewFeature
is defined.
Specifically, when deviceservicename
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DeviceServiceName::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
NfsOnDeviceService
S3OnDeviceService
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 DeviceServiceName
impl DeviceServiceName
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 DeviceServiceName
impl AsRef<str> for DeviceServiceName
source§impl Clone for DeviceServiceName
impl Clone for DeviceServiceName
source§fn clone(&self) -> DeviceServiceName
fn clone(&self) -> DeviceServiceName
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DeviceServiceName
impl Debug for DeviceServiceName
source§impl Display for DeviceServiceName
impl Display for DeviceServiceName
source§impl From<&str> for DeviceServiceName
impl From<&str> for DeviceServiceName
source§impl FromStr for DeviceServiceName
impl FromStr for DeviceServiceName
source§impl Hash for DeviceServiceName
impl Hash for DeviceServiceName
source§impl Ord for DeviceServiceName
impl Ord for DeviceServiceName
source§fn cmp(&self, other: &DeviceServiceName) -> Ordering
fn cmp(&self, other: &DeviceServiceName) -> 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 DeviceServiceName
impl PartialEq for DeviceServiceName
source§fn eq(&self, other: &DeviceServiceName) -> bool
fn eq(&self, other: &DeviceServiceName) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DeviceServiceName
impl PartialOrd for DeviceServiceName
source§fn partial_cmp(&self, other: &DeviceServiceName) -> Option<Ordering>
fn partial_cmp(&self, other: &DeviceServiceName) -> 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 DeviceServiceName
impl StructuralPartialEq for DeviceServiceName
Auto Trait Implementations§
impl Freeze for DeviceServiceName
impl RefUnwindSafe for DeviceServiceName
impl Send for DeviceServiceName
impl Sync for DeviceServiceName
impl Unpin for DeviceServiceName
impl UnwindSafe for DeviceServiceName
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.