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