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