#[non_exhaustive]pub enum OperationName {
LambdaInvoke,
S3ComputeObjectChecksum,
S3DeleteObjectTagging,
S3InitiateRestoreObject,
S3PutObjectAcl,
S3PutObjectCopy,
S3PutObjectLegalHold,
S3PutObjectRetention,
S3PutObjectTagging,
S3ReplicateObject,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against OperationName
, 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 operationname = unimplemented!();
match operationname {
OperationName::LambdaInvoke => { /* ... */ },
OperationName::S3ComputeObjectChecksum => { /* ... */ },
OperationName::S3DeleteObjectTagging => { /* ... */ },
OperationName::S3InitiateRestoreObject => { /* ... */ },
OperationName::S3PutObjectAcl => { /* ... */ },
OperationName::S3PutObjectCopy => { /* ... */ },
OperationName::S3PutObjectLegalHold => { /* ... */ },
OperationName::S3PutObjectRetention => { /* ... */ },
OperationName::S3PutObjectTagging => { /* ... */ },
OperationName::S3ReplicateObject => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when operationname
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant OperationName::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
OperationName::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 OperationName::NewFeature
is defined.
Specifically, when operationname
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on OperationName::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
LambdaInvoke
S3ComputeObjectChecksum
S3DeleteObjectTagging
S3InitiateRestoreObject
S3PutObjectAcl
S3PutObjectCopy
S3PutObjectLegalHold
S3PutObjectRetention
S3PutObjectTagging
S3ReplicateObject
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 OperationName
impl OperationName
Source§impl OperationName
impl OperationName
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 OperationName
impl AsRef<str> for OperationName
Source§impl Clone for OperationName
impl Clone for OperationName
Source§fn clone(&self) -> OperationName
fn clone(&self) -> OperationName
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for OperationName
impl Debug for OperationName
Source§impl Display for OperationName
impl Display for OperationName
Source§impl From<&str> for OperationName
impl From<&str> for OperationName
Source§impl FromStr for OperationName
impl FromStr for OperationName
Source§impl Hash for OperationName
impl Hash for OperationName
Source§impl Ord for OperationName
impl Ord for OperationName
Source§fn cmp(&self, other: &OperationName) -> Ordering
fn cmp(&self, other: &OperationName) -> 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 OperationName
impl PartialEq for OperationName
Source§impl PartialOrd for OperationName
impl PartialOrd for OperationName
impl Eq for OperationName
impl StructuralPartialEq for OperationName
Auto Trait Implementations§
impl Freeze for OperationName
impl RefUnwindSafe for OperationName
impl Send for OperationName
impl Sync for OperationName
impl Unpin for OperationName
impl UnwindSafe for OperationName
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