#[non_exhaustive]pub enum AnalyticsSessionField {
ConversationEndState,
LocaleId,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against AnalyticsSessionField
, 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 analyticssessionfield = unimplemented!();
match analyticssessionfield {
AnalyticsSessionField::ConversationEndState => { /* ... */ },
AnalyticsSessionField::LocaleId => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when analyticssessionfield
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant AnalyticsSessionField::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
AnalyticsSessionField::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 AnalyticsSessionField::NewFeature
is defined.
Specifically, when analyticssessionfield
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on AnalyticsSessionField::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
ConversationEndState
LocaleId
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for AnalyticsSessionField
impl AsRef<str> for AnalyticsSessionField
source§impl Clone for AnalyticsSessionField
impl Clone for AnalyticsSessionField
source§fn clone(&self) -> AnalyticsSessionField
fn clone(&self) -> AnalyticsSessionField
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for AnalyticsSessionField
impl Debug for AnalyticsSessionField
source§impl From<&str> for AnalyticsSessionField
impl From<&str> for AnalyticsSessionField
source§impl FromStr for AnalyticsSessionField
impl FromStr for AnalyticsSessionField
source§impl Hash for AnalyticsSessionField
impl Hash for AnalyticsSessionField
source§impl Ord for AnalyticsSessionField
impl Ord for AnalyticsSessionField
source§fn cmp(&self, other: &AnalyticsSessionField) -> Ordering
fn cmp(&self, other: &AnalyticsSessionField) -> 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 AnalyticsSessionField
impl PartialEq for AnalyticsSessionField
source§fn eq(&self, other: &AnalyticsSessionField) -> bool
fn eq(&self, other: &AnalyticsSessionField) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for AnalyticsSessionField
impl PartialOrd for AnalyticsSessionField
source§fn partial_cmp(&self, other: &AnalyticsSessionField) -> Option<Ordering>
fn partial_cmp(&self, other: &AnalyticsSessionField) -> 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 AnalyticsSessionField
impl StructuralEq for AnalyticsSessionField
impl StructuralPartialEq for AnalyticsSessionField
Auto Trait Implementations§
impl RefUnwindSafe for AnalyticsSessionField
impl Send for AnalyticsSessionField
impl Sync for AnalyticsSessionField
impl Unpin for AnalyticsSessionField
impl UnwindSafe for AnalyticsSessionField
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
§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.