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