Enum aws_sdk_s3::types::Type
source · #[non_exhaustive]pub enum Type {
AmazonCustomerByEmail,
CanonicalUser,
Group,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Type
, 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 type = unimplemented!();
match type {
Type::AmazonCustomerByEmail => { /* ... */ },
Type::CanonicalUser => { /* ... */ },
Type::Group => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when type
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Type::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Type::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 Type::NewFeature
is defined.
Specifically, when type
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Type::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
AmazonCustomerByEmail
CanonicalUser
Group
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§
Trait Implementations§
source§impl Ord for Type
impl Ord for Type
source§impl PartialOrd for Type
impl PartialOrd for Type
impl Eq for Type
impl StructuralPartialEq for Type
Auto Trait Implementations§
impl Freeze for Type
impl RefUnwindSafe for Type
impl Send for Type
impl Sync for Type
impl Unpin for Type
impl UnwindSafe for Type
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.