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