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