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