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