Enum aws_sdk_sesv2::types::ScalingMode
source · #[non_exhaustive]pub enum ScalingMode {
Managed,
Standard,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ScalingMode
, 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 scalingmode = unimplemented!();
match scalingmode {
ScalingMode::Managed => { /* ... */ },
ScalingMode::Standard => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when scalingmode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ScalingMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ScalingMode::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 ScalingMode::NewFeature
is defined.
Specifically, when scalingmode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ScalingMode::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
Managed
Standard
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 ScalingMode
impl ScalingMode
source§impl ScalingMode
impl ScalingMode
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 ScalingMode
impl AsRef<str> for ScalingMode
source§impl Clone for ScalingMode
impl Clone for ScalingMode
source§fn clone(&self) -> ScalingMode
fn clone(&self) -> ScalingMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ScalingMode
impl Debug for ScalingMode
source§impl Display for ScalingMode
impl Display for ScalingMode
source§impl From<&str> for ScalingMode
impl From<&str> for ScalingMode
source§impl FromStr for ScalingMode
impl FromStr for ScalingMode
source§impl Hash for ScalingMode
impl Hash for ScalingMode
source§impl Ord for ScalingMode
impl Ord for ScalingMode
source§fn cmp(&self, other: &ScalingMode) -> Ordering
fn cmp(&self, other: &ScalingMode) -> 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 ScalingMode
impl PartialEq for ScalingMode
source§fn eq(&self, other: &ScalingMode) -> bool
fn eq(&self, other: &ScalingMode) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ScalingMode
impl PartialOrd for ScalingMode
source§fn partial_cmp(&self, other: &ScalingMode) -> Option<Ordering>
fn partial_cmp(&self, other: &ScalingMode) -> 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 ScalingMode
impl StructuralPartialEq for ScalingMode
Auto Trait Implementations§
impl Freeze for ScalingMode
impl RefUnwindSafe for ScalingMode
impl Send for ScalingMode
impl Sync for ScalingMode
impl Unpin for ScalingMode
impl UnwindSafe for ScalingMode
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