#[non_exhaustive]pub enum PositionConfigurationFec {
None,
Rose,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against PositionConfigurationFec, 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 positionconfigurationfec = unimplemented!();
match positionconfigurationfec {
PositionConfigurationFec::None => { /* ... */ },
PositionConfigurationFec::Rose => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when positionconfigurationfec represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant PositionConfigurationFec::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
PositionConfigurationFec::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 PositionConfigurationFec::NewFeature is defined.
Specifically, when positionconfigurationfec represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on PositionConfigurationFec::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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
None
Rose
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 PositionConfigurationFec
impl PositionConfigurationFec
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 PositionConfigurationFec
impl AsRef<str> for PositionConfigurationFec
source§impl Clone for PositionConfigurationFec
impl Clone for PositionConfigurationFec
source§fn clone(&self) -> PositionConfigurationFec
fn clone(&self) -> PositionConfigurationFec
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for PositionConfigurationFec
impl Debug for PositionConfigurationFec
source§impl From<&str> for PositionConfigurationFec
impl From<&str> for PositionConfigurationFec
source§impl FromStr for PositionConfigurationFec
impl FromStr for PositionConfigurationFec
source§impl Hash for PositionConfigurationFec
impl Hash for PositionConfigurationFec
source§impl Ord for PositionConfigurationFec
impl Ord for PositionConfigurationFec
source§fn cmp(&self, other: &PositionConfigurationFec) -> Ordering
fn cmp(&self, other: &PositionConfigurationFec) -> 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 PositionConfigurationFec
impl PartialEq for PositionConfigurationFec
source§fn eq(&self, other: &PositionConfigurationFec) -> bool
fn eq(&self, other: &PositionConfigurationFec) -> bool
self and other values to be equal, and is used
by ==.source§impl PartialOrd for PositionConfigurationFec
impl PartialOrd for PositionConfigurationFec
source§fn partial_cmp(&self, other: &PositionConfigurationFec) -> Option<Ordering>
fn partial_cmp(&self, other: &PositionConfigurationFec) -> 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 PositionConfigurationFec
impl StructuralEq for PositionConfigurationFec
impl StructuralPartialEq for PositionConfigurationFec
Auto Trait Implementations§
impl RefUnwindSafe for PositionConfigurationFec
impl Send for PositionConfigurationFec
impl Sync for PositionConfigurationFec
impl Unpin for PositionConfigurationFec
impl UnwindSafe for PositionConfigurationFec
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> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key and return true if they are equal.