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