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