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