#[non_exhaustive]pub enum RequestTooLargeCode {
RequestTooLarge,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against RequestTooLargeCode
, 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 requesttoolargecode = unimplemented!();
match requesttoolargecode {
RequestTooLargeCode::RequestTooLarge => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when requesttoolargecode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant RequestTooLargeCode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
RequestTooLargeCode::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 RequestTooLargeCode::NewFeature
is defined.
Specifically, when requesttoolargecode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on RequestTooLargeCode::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
RequestTooLarge
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
Source§impl AsRef<str> for RequestTooLargeCode
impl AsRef<str> for RequestTooLargeCode
Source§impl Clone for RequestTooLargeCode
impl Clone for RequestTooLargeCode
Source§fn clone(&self) -> RequestTooLargeCode
fn clone(&self) -> RequestTooLargeCode
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for RequestTooLargeCode
impl Debug for RequestTooLargeCode
Source§impl From<&str> for RequestTooLargeCode
impl From<&str> for RequestTooLargeCode
Source§impl FromStr for RequestTooLargeCode
impl FromStr for RequestTooLargeCode
Source§impl Hash for RequestTooLargeCode
impl Hash for RequestTooLargeCode
Source§impl Ord for RequestTooLargeCode
impl Ord for RequestTooLargeCode
Source§fn cmp(&self, other: &RequestTooLargeCode) -> Ordering
fn cmp(&self, other: &RequestTooLargeCode) -> 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 RequestTooLargeCode
impl PartialEq for RequestTooLargeCode
Source§impl PartialOrd for RequestTooLargeCode
impl PartialOrd for RequestTooLargeCode
impl Eq for RequestTooLargeCode
impl StructuralPartialEq for RequestTooLargeCode
Auto Trait Implementations§
impl Freeze for RequestTooLargeCode
impl RefUnwindSafe for RequestTooLargeCode
impl Send for RequestTooLargeCode
impl Sync for RequestTooLargeCode
impl Unpin for RequestTooLargeCode
impl UnwindSafe for RequestTooLargeCode
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
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.Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more