#[non_exhaustive]
pub enum EncryptionModeValue {
SseKms,
SseS3,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against EncryptionModeValue
, 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 encryptionmodevalue = unimplemented!();
match encryptionmodevalue {
EncryptionModeValue::SseKms => { /* ... */ },
EncryptionModeValue::SseS3 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when encryptionmodevalue
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EncryptionModeValue::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
EncryptionModeValue::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 EncryptionModeValue::NewFeature
is defined.
Specifically, when encryptionmodevalue
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on EncryptionModeValue::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
SseKms
SseS3
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for EncryptionModeValue
impl AsRef<str> for EncryptionModeValue
source§impl Clone for EncryptionModeValue
impl Clone for EncryptionModeValue
source§fn clone(&self) -> EncryptionModeValue
fn clone(&self) -> EncryptionModeValue
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for EncryptionModeValue
impl Debug for EncryptionModeValue
source§impl From<&str> for EncryptionModeValue
impl From<&str> for EncryptionModeValue
source§impl FromStr for EncryptionModeValue
impl FromStr for EncryptionModeValue
source§impl Hash for EncryptionModeValue
impl Hash for EncryptionModeValue
source§impl Ord for EncryptionModeValue
impl Ord for EncryptionModeValue
source§fn cmp(&self, other: &EncryptionModeValue) -> Ordering
fn cmp(&self, other: &EncryptionModeValue) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<EncryptionModeValue> for EncryptionModeValue
impl PartialEq<EncryptionModeValue> for EncryptionModeValue
source§fn eq(&self, other: &EncryptionModeValue) -> bool
fn eq(&self, other: &EncryptionModeValue) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<EncryptionModeValue> for EncryptionModeValue
impl PartialOrd<EncryptionModeValue> for EncryptionModeValue
source§fn partial_cmp(&self, other: &EncryptionModeValue) -> Option<Ordering>
fn partial_cmp(&self, other: &EncryptionModeValue) -> 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 EncryptionModeValue
impl StructuralEq for EncryptionModeValue
impl StructuralPartialEq for EncryptionModeValue
Auto Trait Implementations§
impl RefUnwindSafe for EncryptionModeValue
impl Send for EncryptionModeValue
impl Sync for EncryptionModeValue
impl Unpin for EncryptionModeValue
impl UnwindSafe for EncryptionModeValue
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.