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