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