Enum aws_sdk_s3::types::ChecksumAlgorithm
source · #[non_exhaustive]pub enum ChecksumAlgorithm {
Crc32,
Crc32C,
Sha1,
Sha256,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ChecksumAlgorithm
, 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 checksumalgorithm = unimplemented!();
match checksumalgorithm {
ChecksumAlgorithm::Crc32 => { /* ... */ },
ChecksumAlgorithm::Crc32C => { /* ... */ },
ChecksumAlgorithm::Sha1 => { /* ... */ },
ChecksumAlgorithm::Sha256 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when checksumalgorithm
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ChecksumAlgorithm::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ChecksumAlgorithm::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 ChecksumAlgorithm::NewFeature
is defined.
Specifically, when checksumalgorithm
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ChecksumAlgorithm::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
Crc32
Crc32C
Sha1
Sha256
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 ChecksumAlgorithm
impl ChecksumAlgorithm
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 ChecksumAlgorithm
impl AsRef<str> for ChecksumAlgorithm
source§impl Clone for ChecksumAlgorithm
impl Clone for ChecksumAlgorithm
source§fn clone(&self) -> ChecksumAlgorithm
fn clone(&self) -> ChecksumAlgorithm
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ChecksumAlgorithm
impl Debug for ChecksumAlgorithm
source§impl Display for ChecksumAlgorithm
impl Display for ChecksumAlgorithm
source§impl From<&str> for ChecksumAlgorithm
impl From<&str> for ChecksumAlgorithm
source§impl FromStr for ChecksumAlgorithm
impl FromStr for ChecksumAlgorithm
source§impl Hash for ChecksumAlgorithm
impl Hash for ChecksumAlgorithm
source§impl Ord for ChecksumAlgorithm
impl Ord for ChecksumAlgorithm
source§fn cmp(&self, other: &ChecksumAlgorithm) -> Ordering
fn cmp(&self, other: &ChecksumAlgorithm) -> 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 ChecksumAlgorithm
impl PartialEq for ChecksumAlgorithm
source§impl PartialOrd for ChecksumAlgorithm
impl PartialOrd for ChecksumAlgorithm
impl Eq for ChecksumAlgorithm
impl StructuralPartialEq for ChecksumAlgorithm
Auto Trait Implementations§
impl Freeze for ChecksumAlgorithm
impl RefUnwindSafe for ChecksumAlgorithm
impl Send for ChecksumAlgorithm
impl Sync for ChecksumAlgorithm
impl Unpin for ChecksumAlgorithm
impl UnwindSafe for ChecksumAlgorithm
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.