Enum aws_sdk_s3::types::CompressionType
source · #[non_exhaustive]pub enum CompressionType {
Bzip2,
Gzip,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against CompressionType
, 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 compressiontype = unimplemented!();
match compressiontype {
CompressionType::Bzip2 => { /* ... */ },
CompressionType::Gzip => { /* ... */ },
CompressionType::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when compressiontype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant CompressionType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
CompressionType::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 CompressionType::NewFeature
is defined.
Specifically, when compressiontype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on CompressionType::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
Bzip2
Gzip
None
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 CompressionType
impl CompressionType
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 CompressionType
impl AsRef<str> for CompressionType
source§impl Clone for CompressionType
impl Clone for CompressionType
source§fn clone(&self) -> CompressionType
fn clone(&self) -> CompressionType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for CompressionType
impl Debug for CompressionType
source§impl Display for CompressionType
impl Display for CompressionType
source§impl From<&str> for CompressionType
impl From<&str> for CompressionType
source§impl FromStr for CompressionType
impl FromStr for CompressionType
source§impl Hash for CompressionType
impl Hash for CompressionType
source§impl Ord for CompressionType
impl Ord for CompressionType
source§fn cmp(&self, other: &CompressionType) -> Ordering
fn cmp(&self, other: &CompressionType) -> 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 CompressionType
impl PartialEq for CompressionType
source§impl PartialOrd for CompressionType
impl PartialOrd for CompressionType
impl Eq for CompressionType
impl StructuralPartialEq for CompressionType
Auto Trait Implementations§
impl Freeze for CompressionType
impl RefUnwindSafe for CompressionType
impl Send for CompressionType
impl Sync for CompressionType
impl Unpin for CompressionType
impl UnwindSafe for CompressionType
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.