Enum aws_sdk_chime::types::License
source · #[non_exhaustive]pub enum License {
Basic,
Plus,
Pro,
ProTrial,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against License
, 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 license = unimplemented!();
match license {
License::Basic => { /* ... */ },
License::Plus => { /* ... */ },
License::Pro => { /* ... */ },
License::ProTrial => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when license
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant License::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
License::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 License::NewFeature
is defined.
Specifically, when license
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on License::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
Basic
Plus
Pro
ProTrial
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 License
impl Ord for License
source§impl PartialEq for License
impl PartialEq for License
source§impl PartialOrd for License
impl PartialOrd for License
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 License
impl StructuralPartialEq for License
Auto Trait Implementations§
impl Freeze for License
impl RefUnwindSafe for License
impl Send for License
impl Sync for License
impl Unpin for License
impl UnwindSafe for License
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> 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.