Enum aws_sdk_connect::types::Statistic
source · #[non_exhaustive]pub enum Statistic {
Avg,
Max,
Sum,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Statistic
, 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 statistic = unimplemented!();
match statistic {
Statistic::Avg => { /* ... */ },
Statistic::Max => { /* ... */ },
Statistic::Sum => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when statistic
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Statistic::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Statistic::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 Statistic::NewFeature
is defined.
Specifically, when statistic
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Statistic::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
Avg
Max
Sum
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl Ord for Statistic
impl Ord for Statistic
source§impl PartialEq<Statistic> for Statistic
impl PartialEq<Statistic> for Statistic
source§impl PartialOrd<Statistic> for Statistic
impl PartialOrd<Statistic> for Statistic
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 Statistic
impl StructuralEq for Statistic
impl StructuralPartialEq for Statistic
Auto Trait Implementations§
impl RefUnwindSafe for Statistic
impl Send for Statistic
impl Sync for Statistic
impl Unpin for Statistic
impl UnwindSafe for Statistic
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.