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