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