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