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