Enum aws_sdk_lightsail::types::ForwardValues
source · #[non_exhaustive]pub enum ForwardValues {
All,
AllowList,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ForwardValues
, 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 forwardvalues = unimplemented!();
match forwardvalues {
ForwardValues::All => { /* ... */ },
ForwardValues::AllowList => { /* ... */ },
ForwardValues::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when forwardvalues
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ForwardValues::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ForwardValues::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 ForwardValues::NewFeature
is defined.
Specifically, when forwardvalues
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ForwardValues::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
All
AllowList
None
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 ForwardValues
impl ForwardValues
source§impl ForwardValues
impl ForwardValues
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 ForwardValues
impl AsRef<str> for ForwardValues
source§impl Clone for ForwardValues
impl Clone for ForwardValues
source§fn clone(&self) -> ForwardValues
fn clone(&self) -> ForwardValues
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ForwardValues
impl Debug for ForwardValues
source§impl Display for ForwardValues
impl Display for ForwardValues
source§impl From<&str> for ForwardValues
impl From<&str> for ForwardValues
source§impl FromStr for ForwardValues
impl FromStr for ForwardValues
source§impl Hash for ForwardValues
impl Hash for ForwardValues
source§impl Ord for ForwardValues
impl Ord for ForwardValues
source§fn cmp(&self, other: &ForwardValues) -> Ordering
fn cmp(&self, other: &ForwardValues) -> 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 ForwardValues
impl PartialEq for ForwardValues
source§fn eq(&self, other: &ForwardValues) -> bool
fn eq(&self, other: &ForwardValues) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ForwardValues
impl PartialOrd for ForwardValues
source§fn partial_cmp(&self, other: &ForwardValues) -> Option<Ordering>
fn partial_cmp(&self, other: &ForwardValues) -> 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 ForwardValues
impl StructuralPartialEq for ForwardValues
Auto Trait Implementations§
impl Freeze for ForwardValues
impl RefUnwindSafe for ForwardValues
impl Send for ForwardValues
impl Sync for ForwardValues
impl Unpin for ForwardValues
impl UnwindSafe for ForwardValues
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