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