#[non_exhaustive]pub enum DescribeEndpointsMode {
Default,
GetOnly,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DescribeEndpointsMode
, 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 describeendpointsmode = unimplemented!();
match describeendpointsmode {
DescribeEndpointsMode::Default => { /* ... */ },
DescribeEndpointsMode::GetOnly => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when describeendpointsmode
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DescribeEndpointsMode::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DescribeEndpointsMode::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 DescribeEndpointsMode::NewFeature
is defined.
Specifically, when describeendpointsmode
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DescribeEndpointsMode::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. Optional field, defaults to DEFAULT. Specify DEFAULT for this operation to return your endpoints if any exist, or to create an endpoint for you and return it if one doesn’t already exist. Specify GET_ONLY to return your endpoints if any exist, or an empty list if none exist.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Default
GetOnly
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 DescribeEndpointsMode
impl DescribeEndpointsMode
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 DescribeEndpointsMode
impl AsRef<str> for DescribeEndpointsMode
source§impl Clone for DescribeEndpointsMode
impl Clone for DescribeEndpointsMode
source§fn clone(&self) -> DescribeEndpointsMode
fn clone(&self) -> DescribeEndpointsMode
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for DescribeEndpointsMode
impl Debug for DescribeEndpointsMode
source§impl Display for DescribeEndpointsMode
impl Display for DescribeEndpointsMode
source§impl From<&str> for DescribeEndpointsMode
impl From<&str> for DescribeEndpointsMode
source§impl FromStr for DescribeEndpointsMode
impl FromStr for DescribeEndpointsMode
source§impl Hash for DescribeEndpointsMode
impl Hash for DescribeEndpointsMode
source§impl Ord for DescribeEndpointsMode
impl Ord for DescribeEndpointsMode
source§fn cmp(&self, other: &DescribeEndpointsMode) -> Ordering
fn cmp(&self, other: &DescribeEndpointsMode) -> 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 DescribeEndpointsMode
impl PartialEq for DescribeEndpointsMode
source§fn eq(&self, other: &DescribeEndpointsMode) -> bool
fn eq(&self, other: &DescribeEndpointsMode) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for DescribeEndpointsMode
impl PartialOrd for DescribeEndpointsMode
source§fn partial_cmp(&self, other: &DescribeEndpointsMode) -> Option<Ordering>
fn partial_cmp(&self, other: &DescribeEndpointsMode) -> 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 DescribeEndpointsMode
impl StructuralPartialEq for DescribeEndpointsMode
Auto Trait Implementations§
impl Freeze for DescribeEndpointsMode
impl RefUnwindSafe for DescribeEndpointsMode
impl Send for DescribeEndpointsMode
impl Sync for DescribeEndpointsMode
impl Unpin for DescribeEndpointsMode
impl UnwindSafe for DescribeEndpointsMode
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