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