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