#[non_exhaustive]pub enum UplinkCount {
UplinkCount1,
UplinkCount12,
UplinkCount16,
UplinkCount2,
UplinkCount3,
UplinkCount4,
UplinkCount5,
UplinkCount6,
UplinkCount7,
UplinkCount8,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against UplinkCount
, 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 uplinkcount = unimplemented!();
match uplinkcount {
UplinkCount::UplinkCount1 => { /* ... */ },
UplinkCount::UplinkCount12 => { /* ... */ },
UplinkCount::UplinkCount16 => { /* ... */ },
UplinkCount::UplinkCount2 => { /* ... */ },
UplinkCount::UplinkCount3 => { /* ... */ },
UplinkCount::UplinkCount4 => { /* ... */ },
UplinkCount::UplinkCount5 => { /* ... */ },
UplinkCount::UplinkCount6 => { /* ... */ },
UplinkCount::UplinkCount7 => { /* ... */ },
UplinkCount::UplinkCount8 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when uplinkcount
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant UplinkCount::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
UplinkCount::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 UplinkCount::NewFeature
is defined.
Specifically, when uplinkcount
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on UplinkCount::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
UplinkCount1
UplinkCount12
UplinkCount16
UplinkCount2
UplinkCount3
UplinkCount4
UplinkCount5
UplinkCount6
UplinkCount7
UplinkCount8
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 UplinkCount
impl UplinkCount
Source§impl UplinkCount
impl UplinkCount
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 UplinkCount
impl AsRef<str> for UplinkCount
Source§impl Clone for UplinkCount
impl Clone for UplinkCount
Source§fn clone(&self) -> UplinkCount
fn clone(&self) -> UplinkCount
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for UplinkCount
impl Debug for UplinkCount
Source§impl Display for UplinkCount
impl Display for UplinkCount
Source§impl From<&str> for UplinkCount
impl From<&str> for UplinkCount
Source§impl FromStr for UplinkCount
impl FromStr for UplinkCount
Source§impl Hash for UplinkCount
impl Hash for UplinkCount
Source§impl Ord for UplinkCount
impl Ord for UplinkCount
Source§fn cmp(&self, other: &UplinkCount) -> Ordering
fn cmp(&self, other: &UplinkCount) -> 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 UplinkCount
impl PartialEq for UplinkCount
Source§impl PartialOrd for UplinkCount
impl PartialOrd for UplinkCount
impl Eq for UplinkCount
impl StructuralPartialEq for UplinkCount
Auto Trait Implementations§
impl Freeze for UplinkCount
impl RefUnwindSafe for UplinkCount
impl Send for UplinkCount
impl Sync for UplinkCount
impl Unpin for UplinkCount
impl UnwindSafe for UplinkCount
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