Enum aws_sdk_s3::types::RestoreRequestType
source · #[non_exhaustive]pub enum RestoreRequestType {
Select,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against RestoreRequestType
, 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 restorerequesttype = unimplemented!();
match restorerequesttype {
RestoreRequestType::Select => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when restorerequesttype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant RestoreRequestType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
RestoreRequestType::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 RestoreRequestType::NewFeature
is defined.
Specifically, when restorerequesttype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on RestoreRequestType::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
Select
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 RestoreRequestType
impl RestoreRequestType
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 RestoreRequestType
impl AsRef<str> for RestoreRequestType
source§impl Clone for RestoreRequestType
impl Clone for RestoreRequestType
source§fn clone(&self) -> RestoreRequestType
fn clone(&self) -> RestoreRequestType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for RestoreRequestType
impl Debug for RestoreRequestType
source§impl Display for RestoreRequestType
impl Display for RestoreRequestType
source§impl From<&str> for RestoreRequestType
impl From<&str> for RestoreRequestType
source§impl FromStr for RestoreRequestType
impl FromStr for RestoreRequestType
source§impl Hash for RestoreRequestType
impl Hash for RestoreRequestType
source§impl Ord for RestoreRequestType
impl Ord for RestoreRequestType
source§fn cmp(&self, other: &RestoreRequestType) -> Ordering
fn cmp(&self, other: &RestoreRequestType) -> 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 RestoreRequestType
impl PartialEq for RestoreRequestType
source§impl PartialOrd for RestoreRequestType
impl PartialOrd for RestoreRequestType
impl Eq for RestoreRequestType
impl StructuralPartialEq for RestoreRequestType
Auto Trait Implementations§
impl Freeze for RestoreRequestType
impl RefUnwindSafe for RestoreRequestType
impl Send for RestoreRequestType
impl Sync for RestoreRequestType
impl Unpin for RestoreRequestType
impl UnwindSafe for RestoreRequestType
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)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.