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