Enum aws_sdk_quicksight::types::PaperSize
source · #[non_exhaustive]pub enum PaperSize {
A0,
A1,
A2,
A3,
A4,
A5,
JisB4,
JisB5,
UsLegal,
UsLetter,
UsTabloidLedger,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against PaperSize
, 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 papersize = unimplemented!();
match papersize {
PaperSize::A0 => { /* ... */ },
PaperSize::A1 => { /* ... */ },
PaperSize::A2 => { /* ... */ },
PaperSize::A3 => { /* ... */ },
PaperSize::A4 => { /* ... */ },
PaperSize::A5 => { /* ... */ },
PaperSize::JisB4 => { /* ... */ },
PaperSize::JisB5 => { /* ... */ },
PaperSize::UsLegal => { /* ... */ },
PaperSize::UsLetter => { /* ... */ },
PaperSize::UsTabloidLedger => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when papersize
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant PaperSize::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
PaperSize::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 PaperSize::NewFeature
is defined.
Specifically, when papersize
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on PaperSize::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
A0
A1
A2
A3
A4
A5
JisB4
JisB5
UsLegal
UsLetter
UsTabloidLedger
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§
Trait Implementations§
source§impl Ord for PaperSize
impl Ord for PaperSize
source§impl PartialEq for PaperSize
impl PartialEq for PaperSize
source§impl PartialOrd for PaperSize
impl PartialOrd for PaperSize
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 PaperSize
impl StructuralPartialEq for PaperSize
Auto Trait Implementations§
impl Freeze for PaperSize
impl RefUnwindSafe for PaperSize
impl Send for PaperSize
impl Sync for PaperSize
impl Unpin for PaperSize
impl UnwindSafe for PaperSize
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