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