#[non_exhaustive]pub enum MaximumSupportedWeightLbs {
Max1400Lbs,
Max1600Lbs,
Max1800Lbs,
Max2000Lbs,
NoLimit,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MaximumSupportedWeightLbs
, 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 maximumsupportedweightlbs = unimplemented!();
match maximumsupportedweightlbs {
MaximumSupportedWeightLbs::Max1400Lbs => { /* ... */ },
MaximumSupportedWeightLbs::Max1600Lbs => { /* ... */ },
MaximumSupportedWeightLbs::Max1800Lbs => { /* ... */ },
MaximumSupportedWeightLbs::Max2000Lbs => { /* ... */ },
MaximumSupportedWeightLbs::NoLimit => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when maximumsupportedweightlbs
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MaximumSupportedWeightLbs::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MaximumSupportedWeightLbs::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 MaximumSupportedWeightLbs::NewFeature
is defined.
Specifically, when maximumsupportedweightlbs
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MaximumSupportedWeightLbs::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
Max1400Lbs
Max1600Lbs
Max1800Lbs
Max2000Lbs
NoLimit
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 MaximumSupportedWeightLbs
impl MaximumSupportedWeightLbs
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 MaximumSupportedWeightLbs
impl AsRef<str> for MaximumSupportedWeightLbs
source§impl Clone for MaximumSupportedWeightLbs
impl Clone for MaximumSupportedWeightLbs
source§fn clone(&self) -> MaximumSupportedWeightLbs
fn clone(&self) -> MaximumSupportedWeightLbs
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for MaximumSupportedWeightLbs
impl Debug for MaximumSupportedWeightLbs
source§impl From<&str> for MaximumSupportedWeightLbs
impl From<&str> for MaximumSupportedWeightLbs
source§impl FromStr for MaximumSupportedWeightLbs
impl FromStr for MaximumSupportedWeightLbs
source§impl Hash for MaximumSupportedWeightLbs
impl Hash for MaximumSupportedWeightLbs
source§impl Ord for MaximumSupportedWeightLbs
impl Ord for MaximumSupportedWeightLbs
source§fn cmp(&self, other: &MaximumSupportedWeightLbs) -> Ordering
fn cmp(&self, other: &MaximumSupportedWeightLbs) -> 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 MaximumSupportedWeightLbs
impl PartialEq for MaximumSupportedWeightLbs
source§fn eq(&self, other: &MaximumSupportedWeightLbs) -> bool
fn eq(&self, other: &MaximumSupportedWeightLbs) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for MaximumSupportedWeightLbs
impl PartialOrd for MaximumSupportedWeightLbs
source§fn partial_cmp(&self, other: &MaximumSupportedWeightLbs) -> Option<Ordering>
fn partial_cmp(&self, other: &MaximumSupportedWeightLbs) -> 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 MaximumSupportedWeightLbs
impl StructuralEq for MaximumSupportedWeightLbs
impl StructuralPartialEq for MaximumSupportedWeightLbs
Auto Trait Implementations§
impl RefUnwindSafe for MaximumSupportedWeightLbs
impl Send for MaximumSupportedWeightLbs
impl Sync for MaximumSupportedWeightLbs
impl Unpin for MaximumSupportedWeightLbs
impl UnwindSafe for MaximumSupportedWeightLbs
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.