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