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