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