Enum aws_sdk_fsx::types::AutoImportPolicyType
source · #[non_exhaustive]pub enum AutoImportPolicyType {
New,
NewChanged,
NewChangedDeleted,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against AutoImportPolicyType
, 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 autoimportpolicytype = unimplemented!();
match autoimportpolicytype {
AutoImportPolicyType::New => { /* ... */ },
AutoImportPolicyType::NewChanged => { /* ... */ },
AutoImportPolicyType::NewChangedDeleted => { /* ... */ },
AutoImportPolicyType::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when autoimportpolicytype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant AutoImportPolicyType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
AutoImportPolicyType::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 AutoImportPolicyType::NewFeature
is defined.
Specifically, when autoimportpolicytype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on AutoImportPolicyType::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
New
NewChanged
NewChangedDeleted
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 AutoImportPolicyType
impl AutoImportPolicyType
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 AutoImportPolicyType
impl AsRef<str> for AutoImportPolicyType
source§impl Clone for AutoImportPolicyType
impl Clone for AutoImportPolicyType
source§fn clone(&self) -> AutoImportPolicyType
fn clone(&self) -> AutoImportPolicyType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for AutoImportPolicyType
impl Debug for AutoImportPolicyType
source§impl Display for AutoImportPolicyType
impl Display for AutoImportPolicyType
source§impl From<&str> for AutoImportPolicyType
impl From<&str> for AutoImportPolicyType
source§impl FromStr for AutoImportPolicyType
impl FromStr for AutoImportPolicyType
source§impl Hash for AutoImportPolicyType
impl Hash for AutoImportPolicyType
source§impl Ord for AutoImportPolicyType
impl Ord for AutoImportPolicyType
source§fn cmp(&self, other: &AutoImportPolicyType) -> Ordering
fn cmp(&self, other: &AutoImportPolicyType) -> 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 AutoImportPolicyType
impl PartialEq for AutoImportPolicyType
source§fn eq(&self, other: &AutoImportPolicyType) -> bool
fn eq(&self, other: &AutoImportPolicyType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for AutoImportPolicyType
impl PartialOrd for AutoImportPolicyType
source§fn partial_cmp(&self, other: &AutoImportPolicyType) -> Option<Ordering>
fn partial_cmp(&self, other: &AutoImportPolicyType) -> 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 AutoImportPolicyType
impl StructuralPartialEq for AutoImportPolicyType
Auto Trait Implementations§
impl Freeze for AutoImportPolicyType
impl RefUnwindSafe for AutoImportPolicyType
impl Send for AutoImportPolicyType
impl Sync for AutoImportPolicyType
impl Unpin for AutoImportPolicyType
impl UnwindSafe for AutoImportPolicyType
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
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.