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