#[non_exhaustive]pub enum FragmentSelectorType {
ProducerTimestamp,
ServerTimestamp,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against FragmentSelectorType
, 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 fragmentselectortype = unimplemented!();
match fragmentselectortype {
FragmentSelectorType::ProducerTimestamp => { /* ... */ },
FragmentSelectorType::ServerTimestamp => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when fragmentselectortype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant FragmentSelectorType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
FragmentSelectorType::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 FragmentSelectorType::NewFeature
is defined.
Specifically, when fragmentselectortype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on FragmentSelectorType::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
ProducerTimestamp
ServerTimestamp
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for FragmentSelectorType
impl AsRef<str> for FragmentSelectorType
source§impl Clone for FragmentSelectorType
impl Clone for FragmentSelectorType
source§fn clone(&self) -> FragmentSelectorType
fn clone(&self) -> FragmentSelectorType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for FragmentSelectorType
impl Debug for FragmentSelectorType
source§impl From<&str> for FragmentSelectorType
impl From<&str> for FragmentSelectorType
source§impl FromStr for FragmentSelectorType
impl FromStr for FragmentSelectorType
source§impl Hash for FragmentSelectorType
impl Hash for FragmentSelectorType
source§impl Ord for FragmentSelectorType
impl Ord for FragmentSelectorType
source§fn cmp(&self, other: &FragmentSelectorType) -> Ordering
fn cmp(&self, other: &FragmentSelectorType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<FragmentSelectorType> for FragmentSelectorType
impl PartialEq<FragmentSelectorType> for FragmentSelectorType
source§fn eq(&self, other: &FragmentSelectorType) -> bool
fn eq(&self, other: &FragmentSelectorType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<FragmentSelectorType> for FragmentSelectorType
impl PartialOrd<FragmentSelectorType> for FragmentSelectorType
source§fn partial_cmp(&self, other: &FragmentSelectorType) -> Option<Ordering>
fn partial_cmp(&self, other: &FragmentSelectorType) -> 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 FragmentSelectorType
impl StructuralEq for FragmentSelectorType
impl StructuralPartialEq for FragmentSelectorType
Auto Trait Implementations§
impl RefUnwindSafe for FragmentSelectorType
impl Send for FragmentSelectorType
impl Sync for FragmentSelectorType
impl Unpin for FragmentSelectorType
impl UnwindSafe for FragmentSelectorType
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<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.