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