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