Enum aws_sdk_s3::types::InventoryFrequency
source · #[non_exhaustive]pub enum InventoryFrequency {
Daily,
Weekly,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against InventoryFrequency
, 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 inventoryfrequency = unimplemented!();
match inventoryfrequency {
InventoryFrequency::Daily => { /* ... */ },
InventoryFrequency::Weekly => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when inventoryfrequency
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant InventoryFrequency::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
InventoryFrequency::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 InventoryFrequency::NewFeature
is defined.
Specifically, when inventoryfrequency
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on InventoryFrequency::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
Daily
Weekly
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 InventoryFrequency
impl InventoryFrequency
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 InventoryFrequency
impl AsRef<str> for InventoryFrequency
source§impl Clone for InventoryFrequency
impl Clone for InventoryFrequency
source§fn clone(&self) -> InventoryFrequency
fn clone(&self) -> InventoryFrequency
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for InventoryFrequency
impl Debug for InventoryFrequency
source§impl Display for InventoryFrequency
impl Display for InventoryFrequency
source§impl From<&str> for InventoryFrequency
impl From<&str> for InventoryFrequency
source§impl FromStr for InventoryFrequency
impl FromStr for InventoryFrequency
source§impl Hash for InventoryFrequency
impl Hash for InventoryFrequency
source§impl Ord for InventoryFrequency
impl Ord for InventoryFrequency
source§fn cmp(&self, other: &InventoryFrequency) -> Ordering
fn cmp(&self, other: &InventoryFrequency) -> 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 InventoryFrequency
impl PartialEq for InventoryFrequency
source§impl PartialOrd for InventoryFrequency
impl PartialOrd for InventoryFrequency
impl Eq for InventoryFrequency
impl StructuralPartialEq for InventoryFrequency
Auto Trait Implementations§
impl Freeze for InventoryFrequency
impl RefUnwindSafe for InventoryFrequency
impl Send for InventoryFrequency
impl Sync for InventoryFrequency
impl Unpin for InventoryFrequency
impl UnwindSafe for InventoryFrequency
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<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)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.