#[non_exhaustive]pub enum SkipModelValidation {
All,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against SkipModelValidation
, 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 skipmodelvalidation = unimplemented!();
match skipmodelvalidation {
SkipModelValidation::All => { /* ... */ },
SkipModelValidation::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when skipmodelvalidation
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant SkipModelValidation::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
SkipModelValidation::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 SkipModelValidation::NewFeature
is defined.
Specifically, when skipmodelvalidation
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on SkipModelValidation::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
None
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl SkipModelValidation
impl SkipModelValidation
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for SkipModelValidation
impl AsRef<str> for SkipModelValidation
source§impl Clone for SkipModelValidation
impl Clone for SkipModelValidation
source§fn clone(&self) -> SkipModelValidation
fn clone(&self) -> SkipModelValidation
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for SkipModelValidation
impl Debug for SkipModelValidation
source§impl From<&str> for SkipModelValidation
impl From<&str> for SkipModelValidation
source§impl FromStr for SkipModelValidation
impl FromStr for SkipModelValidation
source§impl Hash for SkipModelValidation
impl Hash for SkipModelValidation
source§impl Ord for SkipModelValidation
impl Ord for SkipModelValidation
source§fn cmp(&self, other: &SkipModelValidation) -> Ordering
fn cmp(&self, other: &SkipModelValidation) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq for SkipModelValidation
impl PartialEq for SkipModelValidation
source§fn eq(&self, other: &SkipModelValidation) -> bool
fn eq(&self, other: &SkipModelValidation) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for SkipModelValidation
impl PartialOrd for SkipModelValidation
source§fn partial_cmp(&self, other: &SkipModelValidation) -> Option<Ordering>
fn partial_cmp(&self, other: &SkipModelValidation) -> 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 SkipModelValidation
impl StructuralEq for SkipModelValidation
impl StructuralPartialEq for SkipModelValidation
Auto Trait Implementations§
impl RefUnwindSafe for SkipModelValidation
impl Send for SkipModelValidation
impl Sync for SkipModelValidation
impl Unpin for SkipModelValidation
impl UnwindSafe for SkipModelValidation
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§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,
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.