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