#[non_exhaustive]pub enum DirectoryListingOptimization {
Disabled,
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DirectoryListingOptimization
, 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 directorylistingoptimization = unimplemented!();
match directorylistingoptimization {
DirectoryListingOptimization::Disabled => { /* ... */ },
DirectoryListingOptimization::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when directorylistingoptimization
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DirectoryListingOptimization::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DirectoryListingOptimization::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 DirectoryListingOptimization::NewFeature
is defined.
Specifically, when directorylistingoptimization
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DirectoryListingOptimization::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. Indicates whether optimization to directory listing on S3 servers is used. Disabled by default for compatibility.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Disabled
Enabled
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 DirectoryListingOptimization
impl DirectoryListingOptimization
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 DirectoryListingOptimization
impl AsRef<str> for DirectoryListingOptimization
source§impl Clone for DirectoryListingOptimization
impl Clone for DirectoryListingOptimization
source§fn clone(&self) -> DirectoryListingOptimization
fn clone(&self) -> DirectoryListingOptimization
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DirectoryListingOptimization
impl Debug for DirectoryListingOptimization
source§impl From<&str> for DirectoryListingOptimization
impl From<&str> for DirectoryListingOptimization
source§impl Hash for DirectoryListingOptimization
impl Hash for DirectoryListingOptimization
source§impl Ord for DirectoryListingOptimization
impl Ord for DirectoryListingOptimization
source§fn cmp(&self, other: &DirectoryListingOptimization) -> Ordering
fn cmp(&self, other: &DirectoryListingOptimization) -> 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 DirectoryListingOptimization
impl PartialEq for DirectoryListingOptimization
source§fn eq(&self, other: &DirectoryListingOptimization) -> bool
fn eq(&self, other: &DirectoryListingOptimization) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DirectoryListingOptimization
impl PartialOrd for DirectoryListingOptimization
source§fn partial_cmp(&self, other: &DirectoryListingOptimization) -> Option<Ordering>
fn partial_cmp(&self, other: &DirectoryListingOptimization) -> 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 DirectoryListingOptimization
impl StructuralPartialEq for DirectoryListingOptimization
Auto Trait Implementations§
impl Freeze for DirectoryListingOptimization
impl RefUnwindSafe for DirectoryListingOptimization
impl Send for DirectoryListingOptimization
impl Sync for DirectoryListingOptimization
impl Unpin for DirectoryListingOptimization
impl UnwindSafe for DirectoryListingOptimization
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.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more