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