#[non_exhaustive]pub enum FilterNameStringType {
All,
Description,
Name,
OwningService,
PrimaryRegion,
TagKey,
TagValue,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against FilterNameStringType
, 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 filternamestringtype = unimplemented!();
match filternamestringtype {
FilterNameStringType::All => { /* ... */ },
FilterNameStringType::Description => { /* ... */ },
FilterNameStringType::Name => { /* ... */ },
FilterNameStringType::OwningService => { /* ... */ },
FilterNameStringType::PrimaryRegion => { /* ... */ },
FilterNameStringType::TagKey => { /* ... */ },
FilterNameStringType::TagValue => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when filternamestringtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant FilterNameStringType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
FilterNameStringType::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 FilterNameStringType::NewFeature
is defined.
Specifically, when filternamestringtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on FilterNameStringType::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
All
Description
Name
OwningService
PrimaryRegion
TagKey
TagValue
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 FilterNameStringType
impl FilterNameStringType
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 FilterNameStringType
impl AsRef<str> for FilterNameStringType
source§impl Clone for FilterNameStringType
impl Clone for FilterNameStringType
source§fn clone(&self) -> FilterNameStringType
fn clone(&self) -> FilterNameStringType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for FilterNameStringType
impl Debug for FilterNameStringType
source§impl Display for FilterNameStringType
impl Display for FilterNameStringType
source§impl From<&str> for FilterNameStringType
impl From<&str> for FilterNameStringType
source§impl FromStr for FilterNameStringType
impl FromStr for FilterNameStringType
source§impl Hash for FilterNameStringType
impl Hash for FilterNameStringType
source§impl Ord for FilterNameStringType
impl Ord for FilterNameStringType
source§fn cmp(&self, other: &FilterNameStringType) -> Ordering
fn cmp(&self, other: &FilterNameStringType) -> 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 FilterNameStringType
impl PartialEq for FilterNameStringType
source§impl PartialOrd for FilterNameStringType
impl PartialOrd for FilterNameStringType
impl Eq for FilterNameStringType
impl StructuralPartialEq for FilterNameStringType
Auto Trait Implementations§
impl Freeze for FilterNameStringType
impl RefUnwindSafe for FilterNameStringType
impl Send for FilterNameStringType
impl Sync for FilterNameStringType
impl Unpin for FilterNameStringType
impl UnwindSafe for FilterNameStringType
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
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.