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