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