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