Enum aws_sdk_signer::types::HashAlgorithm
source · #[non_exhaustive]pub enum HashAlgorithm {
Sha1,
Sha256,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against HashAlgorithm
, 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 hashalgorithm = unimplemented!();
match hashalgorithm {
HashAlgorithm::Sha1 => { /* ... */ },
HashAlgorithm::Sha256 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when hashalgorithm
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant HashAlgorithm::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
HashAlgorithm::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 HashAlgorithm::NewFeature
is defined.
Specifically, when hashalgorithm
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on HashAlgorithm::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
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 HashAlgorithm
impl HashAlgorithm
source§impl HashAlgorithm
impl HashAlgorithm
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 HashAlgorithm
impl AsRef<str> for HashAlgorithm
source§impl Clone for HashAlgorithm
impl Clone for HashAlgorithm
source§fn clone(&self) -> HashAlgorithm
fn clone(&self) -> HashAlgorithm
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for HashAlgorithm
impl Debug for HashAlgorithm
source§impl Display for HashAlgorithm
impl Display for HashAlgorithm
source§impl From<&str> for HashAlgorithm
impl From<&str> for HashAlgorithm
source§impl FromStr for HashAlgorithm
impl FromStr for HashAlgorithm
source§impl Hash for HashAlgorithm
impl Hash for HashAlgorithm
source§impl Ord for HashAlgorithm
impl Ord for HashAlgorithm
source§fn cmp(&self, other: &HashAlgorithm) -> Ordering
fn cmp(&self, other: &HashAlgorithm) -> 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 HashAlgorithm
impl PartialEq for HashAlgorithm
source§fn eq(&self, other: &HashAlgorithm) -> bool
fn eq(&self, other: &HashAlgorithm) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for HashAlgorithm
impl PartialOrd for HashAlgorithm
source§fn partial_cmp(&self, other: &HashAlgorithm) -> Option<Ordering>
fn partial_cmp(&self, other: &HashAlgorithm) -> 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 HashAlgorithm
impl StructuralPartialEq for HashAlgorithm
Auto Trait Implementations§
impl Freeze for HashAlgorithm
impl RefUnwindSafe for HashAlgorithm
impl Send for HashAlgorithm
impl Sync for HashAlgorithm
impl Unpin for HashAlgorithm
impl UnwindSafe for HashAlgorithm
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<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.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more