Enum aws_sdk_fsx::types::RetentionPeriodType
source · #[non_exhaustive]pub enum RetentionPeriodType {
Days,
Hours,
Infinite,
Minutes,
Months,
Seconds,
Unspecified,
Years,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against RetentionPeriodType
, 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 retentionperiodtype = unimplemented!();
match retentionperiodtype {
RetentionPeriodType::Days => { /* ... */ },
RetentionPeriodType::Hours => { /* ... */ },
RetentionPeriodType::Infinite => { /* ... */ },
RetentionPeriodType::Minutes => { /* ... */ },
RetentionPeriodType::Months => { /* ... */ },
RetentionPeriodType::Seconds => { /* ... */ },
RetentionPeriodType::Unspecified => { /* ... */ },
RetentionPeriodType::Years => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when retentionperiodtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant RetentionPeriodType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
RetentionPeriodType::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 RetentionPeriodType::NewFeature
is defined.
Specifically, when retentionperiodtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on RetentionPeriodType::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
Days
Hours
Infinite
Minutes
Months
Seconds
Unspecified
Years
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 RetentionPeriodType
impl RetentionPeriodType
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 RetentionPeriodType
impl AsRef<str> for RetentionPeriodType
source§impl Clone for RetentionPeriodType
impl Clone for RetentionPeriodType
source§fn clone(&self) -> RetentionPeriodType
fn clone(&self) -> RetentionPeriodType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for RetentionPeriodType
impl Debug for RetentionPeriodType
source§impl Display for RetentionPeriodType
impl Display for RetentionPeriodType
source§impl From<&str> for RetentionPeriodType
impl From<&str> for RetentionPeriodType
source§impl FromStr for RetentionPeriodType
impl FromStr for RetentionPeriodType
source§impl Hash for RetentionPeriodType
impl Hash for RetentionPeriodType
source§impl Ord for RetentionPeriodType
impl Ord for RetentionPeriodType
source§fn cmp(&self, other: &RetentionPeriodType) -> Ordering
fn cmp(&self, other: &RetentionPeriodType) -> 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 RetentionPeriodType
impl PartialEq for RetentionPeriodType
source§fn eq(&self, other: &RetentionPeriodType) -> bool
fn eq(&self, other: &RetentionPeriodType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for RetentionPeriodType
impl PartialOrd for RetentionPeriodType
source§fn partial_cmp(&self, other: &RetentionPeriodType) -> Option<Ordering>
fn partial_cmp(&self, other: &RetentionPeriodType) -> 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 RetentionPeriodType
impl StructuralPartialEq for RetentionPeriodType
Auto Trait Implementations§
impl Freeze for RetentionPeriodType
impl RefUnwindSafe for RetentionPeriodType
impl Send for RetentionPeriodType
impl Sync for RetentionPeriodType
impl Unpin for RetentionPeriodType
impl UnwindSafe for RetentionPeriodType
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.