#[non_exhaustive]
pub enum S3ContinuousClassificationType {
Full,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against S3ContinuousClassificationType, 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 s3continuousclassificationtype = unimplemented!();
match s3continuousclassificationtype {
S3ContinuousClassificationType::Full => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when s3continuousclassificationtype represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant S3ContinuousClassificationType::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
S3ContinuousClassificationType::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 S3ContinuousClassificationType::NewFeature is defined.
Specifically, when s3continuousclassificationtype represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on S3ContinuousClassificationType::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
Full
Unknown(UnknownVariantValue)
Unknown contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for S3ContinuousClassificationType
impl AsRef<str> for S3ContinuousClassificationType
source§impl Clone for S3ContinuousClassificationType
impl Clone for S3ContinuousClassificationType
source§fn clone(&self) -> S3ContinuousClassificationType
fn clone(&self) -> S3ContinuousClassificationType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl From<&str> for S3ContinuousClassificationType
impl From<&str> for S3ContinuousClassificationType
source§impl Ord for S3ContinuousClassificationType
impl Ord for S3ContinuousClassificationType
source§fn cmp(&self, other: &S3ContinuousClassificationType) -> Ordering
fn cmp(&self, other: &S3ContinuousClassificationType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<S3ContinuousClassificationType> for S3ContinuousClassificationType
impl PartialEq<S3ContinuousClassificationType> for S3ContinuousClassificationType
source§fn eq(&self, other: &S3ContinuousClassificationType) -> bool
fn eq(&self, other: &S3ContinuousClassificationType) -> bool
self and other values to be equal, and is used
by ==.source§impl PartialOrd<S3ContinuousClassificationType> for S3ContinuousClassificationType
impl PartialOrd<S3ContinuousClassificationType> for S3ContinuousClassificationType
source§fn partial_cmp(&self, other: &S3ContinuousClassificationType) -> Option<Ordering>
fn partial_cmp(&self, other: &S3ContinuousClassificationType) -> 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 S3ContinuousClassificationType
impl StructuralEq for S3ContinuousClassificationType
impl StructuralPartialEq for S3ContinuousClassificationType
Auto Trait Implementations§
impl RefUnwindSafe for S3ContinuousClassificationType
impl Send for S3ContinuousClassificationType
impl Sync for S3ContinuousClassificationType
impl Unpin for S3ContinuousClassificationType
impl UnwindSafe for S3ContinuousClassificationType
Blanket Implementations§
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.