Enum aws_sdk_s3::types::ChecksumMode
source · #[non_exhaustive]pub enum ChecksumMode {
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ChecksumMode
, 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 checksummode = unimplemented!();
match checksummode {
ChecksumMode::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when checksummode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ChecksumMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ChecksumMode::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 ChecksumMode::NewFeature
is defined.
Specifically, when checksummode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ChecksumMode::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
Enabled
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§
source§impl ChecksumMode
impl ChecksumMode
source§impl ChecksumMode
impl ChecksumMode
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for ChecksumMode
impl AsRef<str> for ChecksumMode
source§impl Clone for ChecksumMode
impl Clone for ChecksumMode
source§fn clone(&self) -> ChecksumMode
fn clone(&self) -> ChecksumMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ChecksumMode
impl Debug for ChecksumMode
source§impl Display for ChecksumMode
impl Display for ChecksumMode
source§impl From<&str> for ChecksumMode
impl From<&str> for ChecksumMode
source§impl FromStr for ChecksumMode
impl FromStr for ChecksumMode
source§impl Hash for ChecksumMode
impl Hash for ChecksumMode
source§impl Ord for ChecksumMode
impl Ord for ChecksumMode
source§fn cmp(&self, other: &ChecksumMode) -> Ordering
fn cmp(&self, other: &ChecksumMode) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for ChecksumMode
impl PartialEq for ChecksumMode
source§impl PartialOrd for ChecksumMode
impl PartialOrd for ChecksumMode
impl Eq for ChecksumMode
impl StructuralPartialEq for ChecksumMode
Auto Trait Implementations§
impl Freeze for ChecksumMode
impl RefUnwindSafe for ChecksumMode
impl Send for ChecksumMode
impl Sync for ChecksumMode
impl Unpin for ChecksumMode
impl UnwindSafe for ChecksumMode
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)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.