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