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