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