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