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