#[non_exhaustive]
pub enum EdgePresetDeploymentType {
GreengrassV2Component,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against EdgePresetDeploymentType
, 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 edgepresetdeploymenttype = unimplemented!();
match edgepresetdeploymenttype {
EdgePresetDeploymentType::GreengrassV2Component => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when edgepresetdeploymenttype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EdgePresetDeploymentType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
EdgePresetDeploymentType::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 EdgePresetDeploymentType::NewFeature
is defined.
Specifically, when edgepresetdeploymenttype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on EdgePresetDeploymentType::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
GreengrassV2Component
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for EdgePresetDeploymentType
impl AsRef<str> for EdgePresetDeploymentType
source§impl Clone for EdgePresetDeploymentType
impl Clone for EdgePresetDeploymentType
source§fn clone(&self) -> EdgePresetDeploymentType
fn clone(&self) -> EdgePresetDeploymentType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for EdgePresetDeploymentType
impl Debug for EdgePresetDeploymentType
source§impl From<&str> for EdgePresetDeploymentType
impl From<&str> for EdgePresetDeploymentType
source§impl FromStr for EdgePresetDeploymentType
impl FromStr for EdgePresetDeploymentType
source§impl Hash for EdgePresetDeploymentType
impl Hash for EdgePresetDeploymentType
source§impl Ord for EdgePresetDeploymentType
impl Ord for EdgePresetDeploymentType
source§fn cmp(&self, other: &EdgePresetDeploymentType) -> Ordering
fn cmp(&self, other: &EdgePresetDeploymentType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<EdgePresetDeploymentType> for EdgePresetDeploymentType
impl PartialEq<EdgePresetDeploymentType> for EdgePresetDeploymentType
source§fn eq(&self, other: &EdgePresetDeploymentType) -> bool
fn eq(&self, other: &EdgePresetDeploymentType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<EdgePresetDeploymentType> for EdgePresetDeploymentType
impl PartialOrd<EdgePresetDeploymentType> for EdgePresetDeploymentType
source§fn partial_cmp(&self, other: &EdgePresetDeploymentType) -> Option<Ordering>
fn partial_cmp(&self, other: &EdgePresetDeploymentType) -> 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 EdgePresetDeploymentType
impl StructuralEq for EdgePresetDeploymentType
impl StructuralPartialEq for EdgePresetDeploymentType
Auto Trait Implementations§
impl RefUnwindSafe for EdgePresetDeploymentType
impl Send for EdgePresetDeploymentType
impl Sync for EdgePresetDeploymentType
impl Unpin for EdgePresetDeploymentType
impl UnwindSafe for EdgePresetDeploymentType
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.