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