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