Enum aws_sdk_ecs::types::Compatibility
source · #[non_exhaustive]pub enum Compatibility {
Ec2,
External,
Fargate,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Compatibility
, 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 compatibility = unimplemented!();
match compatibility {
Compatibility::Ec2 => { /* ... */ },
Compatibility::External => { /* ... */ },
Compatibility::Fargate => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when compatibility
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Compatibility::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Compatibility::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 Compatibility::NewFeature
is defined.
Specifically, when compatibility
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Compatibility::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
Ec2
External
Fargate
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for Compatibility
impl AsRef<str> for Compatibility
source§impl Clone for Compatibility
impl Clone for Compatibility
source§fn clone(&self) -> Compatibility
fn clone(&self) -> Compatibility
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Compatibility
impl Debug for Compatibility
source§impl From<&str> for Compatibility
impl From<&str> for Compatibility
source§impl FromStr for Compatibility
impl FromStr for Compatibility
source§impl Hash for Compatibility
impl Hash for Compatibility
source§impl Ord for Compatibility
impl Ord for Compatibility
source§fn cmp(&self, other: &Compatibility) -> Ordering
fn cmp(&self, other: &Compatibility) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<Compatibility> for Compatibility
impl PartialEq<Compatibility> for Compatibility
source§fn eq(&self, other: &Compatibility) -> bool
fn eq(&self, other: &Compatibility) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<Compatibility> for Compatibility
impl PartialOrd<Compatibility> for Compatibility
source§fn partial_cmp(&self, other: &Compatibility) -> Option<Ordering>
fn partial_cmp(&self, other: &Compatibility) -> 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 Compatibility
impl StructuralEq for Compatibility
impl StructuralPartialEq for Compatibility
Auto Trait Implementations§
impl RefUnwindSafe for Compatibility
impl Send for Compatibility
impl Sync for Compatibility
impl Unpin for Compatibility
impl UnwindSafe for Compatibility
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> 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.