Enum aws_sdk_snowball::types::ImpactLevel
source · #[non_exhaustive]pub enum ImpactLevel {
Il2,
Il4,
Il5,
Il6,
Il99,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ImpactLevel
, 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 impactlevel = unimplemented!();
match impactlevel {
ImpactLevel::Il2 => { /* ... */ },
ImpactLevel::Il4 => { /* ... */ },
ImpactLevel::Il5 => { /* ... */ },
ImpactLevel::Il6 => { /* ... */ },
ImpactLevel::Il99 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when impactlevel
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ImpactLevel::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ImpactLevel::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 ImpactLevel::NewFeature
is defined.
Specifically, when impactlevel
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ImpactLevel::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
Il2
Il4
Il5
Il6
Il99
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 ImpactLevel
impl ImpactLevel
source§impl ImpactLevel
impl ImpactLevel
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 ImpactLevel
impl AsRef<str> for ImpactLevel
source§impl Clone for ImpactLevel
impl Clone for ImpactLevel
source§fn clone(&self) -> ImpactLevel
fn clone(&self) -> ImpactLevel
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ImpactLevel
impl Debug for ImpactLevel
source§impl Display for ImpactLevel
impl Display for ImpactLevel
source§impl From<&str> for ImpactLevel
impl From<&str> for ImpactLevel
source§impl FromStr for ImpactLevel
impl FromStr for ImpactLevel
source§impl Hash for ImpactLevel
impl Hash for ImpactLevel
source§impl Ord for ImpactLevel
impl Ord for ImpactLevel
source§fn cmp(&self, other: &ImpactLevel) -> Ordering
fn cmp(&self, other: &ImpactLevel) -> 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 ImpactLevel
impl PartialEq for ImpactLevel
source§fn eq(&self, other: &ImpactLevel) -> bool
fn eq(&self, other: &ImpactLevel) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ImpactLevel
impl PartialOrd for ImpactLevel
source§fn partial_cmp(&self, other: &ImpactLevel) -> Option<Ordering>
fn partial_cmp(&self, other: &ImpactLevel) -> 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 ImpactLevel
impl StructuralPartialEq for ImpactLevel
Auto Trait Implementations§
impl Freeze for ImpactLevel
impl RefUnwindSafe for ImpactLevel
impl Send for ImpactLevel
impl Sync for ImpactLevel
impl Unpin for ImpactLevel
impl UnwindSafe for ImpactLevel
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.