#[non_exhaustive]pub enum GroupBy {
All,
Yearly,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against GroupBy, 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 groupby = unimplemented!();
match groupby {
GroupBy::All => { /* ... */ },
GroupBy::Yearly => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when groupby represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant GroupBy::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
GroupBy::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 GroupBy::NewFeature is defined.
Specifically, when groupby represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on GroupBy::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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
ALL
Yearly
YEARLY
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§
Trait Implementations§
source§impl Ord for GroupBy
impl Ord for GroupBy
source§impl PartialEq for GroupBy
impl PartialEq for GroupBy
source§impl PartialOrd for GroupBy
impl PartialOrd for GroupBy
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 GroupBy
impl StructuralEq for GroupBy
impl StructuralPartialEq for GroupBy
Auto Trait Implementations§
impl RefUnwindSafe for GroupBy
impl Send for GroupBy
impl Sync for GroupBy
impl Unpin for GroupBy
impl UnwindSafe for GroupBy
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.