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