#[non_exhaustive]pub enum ReportPackagingType {
None,
Zip,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ReportPackagingType
, 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 reportpackagingtype = unimplemented!();
match reportpackagingtype {
ReportPackagingType::None => { /* ... */ },
ReportPackagingType::Zip => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when reportpackagingtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ReportPackagingType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ReportPackagingType::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 ReportPackagingType::NewFeature
is defined.
Specifically, when reportpackagingtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ReportPackagingType::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
None
Zip
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 ReportPackagingType
impl ReportPackagingType
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 ReportPackagingType
impl AsRef<str> for ReportPackagingType
source§impl Clone for ReportPackagingType
impl Clone for ReportPackagingType
source§fn clone(&self) -> ReportPackagingType
fn clone(&self) -> ReportPackagingType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ReportPackagingType
impl Debug for ReportPackagingType
source§impl From<&str> for ReportPackagingType
impl From<&str> for ReportPackagingType
source§impl FromStr for ReportPackagingType
impl FromStr for ReportPackagingType
source§impl Hash for ReportPackagingType
impl Hash for ReportPackagingType
source§impl Ord for ReportPackagingType
impl Ord for ReportPackagingType
source§fn cmp(&self, other: &ReportPackagingType) -> Ordering
fn cmp(&self, other: &ReportPackagingType) -> 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 ReportPackagingType
impl PartialEq for ReportPackagingType
source§fn eq(&self, other: &ReportPackagingType) -> bool
fn eq(&self, other: &ReportPackagingType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ReportPackagingType
impl PartialOrd for ReportPackagingType
source§fn partial_cmp(&self, other: &ReportPackagingType) -> Option<Ordering>
fn partial_cmp(&self, other: &ReportPackagingType) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for ReportPackagingType
impl StructuralEq for ReportPackagingType
impl StructuralPartialEq for ReportPackagingType
Auto Trait Implementations§
impl RefUnwindSafe for ReportPackagingType
impl Send for ReportPackagingType
impl Sync for ReportPackagingType
impl Unpin for ReportPackagingType
impl UnwindSafe for ReportPackagingType
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.