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