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