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