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