Enum aws_sdk_cloudfront::types::Method
source · #[non_exhaustive]
pub enum Method {
Delete,
Get,
Head,
Options,
Patch,
Post,
Put,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against Method
, 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 method = unimplemented!();
match method {
Method::Delete => { /* ... */ },
Method::Get => { /* ... */ },
Method::Head => { /* ... */ },
Method::Options => { /* ... */ },
Method::Patch => { /* ... */ },
Method::Post => { /* ... */ },
Method::Put => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when method
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant Method::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
Method::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 Method::NewFeature
is defined.
Specifically, when method
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on Method::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
Delete
Get
Head
Options
Patch
Post
Put
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl Ord for Method
impl Ord for Method
source§impl PartialEq<Method> for Method
impl PartialEq<Method> for Method
source§impl PartialOrd<Method> for Method
impl PartialOrd<Method> for Method
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 Method
impl StructuralEq for Method
impl StructuralPartialEq for Method
Auto Trait Implementations§
impl RefUnwindSafe for Method
impl Send for Method
impl Sync for Method
impl Unpin for Method
impl UnwindSafe for Method
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.