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