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