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