Enum aws_sdk_transfer::types::As2Transport
source · #[non_exhaustive]pub enum As2Transport {
Http,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against As2Transport
, 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 as2transport = unimplemented!();
match as2transport {
As2Transport::Http => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when as2transport
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant As2Transport::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
As2Transport::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 As2Transport::NewFeature
is defined.
Specifically, when as2transport
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on As2Transport::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
Http
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 As2Transport
impl As2Transport
source§impl As2Transport
impl As2Transport
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 As2Transport
impl AsRef<str> for As2Transport
source§impl Clone for As2Transport
impl Clone for As2Transport
source§fn clone(&self) -> As2Transport
fn clone(&self) -> As2Transport
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for As2Transport
impl Debug for As2Transport
source§impl Display for As2Transport
impl Display for As2Transport
source§impl From<&str> for As2Transport
impl From<&str> for As2Transport
source§impl FromStr for As2Transport
impl FromStr for As2Transport
source§impl Hash for As2Transport
impl Hash for As2Transport
source§impl Ord for As2Transport
impl Ord for As2Transport
source§fn cmp(&self, other: &As2Transport) -> Ordering
fn cmp(&self, other: &As2Transport) -> 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 As2Transport
impl PartialEq for As2Transport
source§fn eq(&self, other: &As2Transport) -> bool
fn eq(&self, other: &As2Transport) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for As2Transport
impl PartialOrd for As2Transport
source§fn partial_cmp(&self, other: &As2Transport) -> Option<Ordering>
fn partial_cmp(&self, other: &As2Transport) -> 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 As2Transport
impl StructuralPartialEq for As2Transport
Auto Trait Implementations§
impl Freeze for As2Transport
impl RefUnwindSafe for As2Transport
impl Send for As2Transport
impl Sync for As2Transport
impl Unpin for As2Transport
impl UnwindSafe for As2Transport
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