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