Enum aws_sdk_lightsail::types::HeaderEnum
source · #[non_exhaustive]pub enum HeaderEnum {
Show 16 variants
Accept,
AcceptCharset,
AcceptDatetime,
AcceptEncoding,
AcceptLanguage,
Authorization,
CloudFrontForwardedProto,
CloudFrontIsDesktopViewer,
CloudFrontIsMobileViewer,
CloudFrontIsSmartTvViewer,
CloudFrontIsTabletViewer,
CloudFrontViewerCountry,
Host,
Origin,
Referer,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against HeaderEnum
, 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 headerenum = unimplemented!();
match headerenum {
HeaderEnum::Accept => { /* ... */ },
HeaderEnum::AcceptCharset => { /* ... */ },
HeaderEnum::AcceptDatetime => { /* ... */ },
HeaderEnum::AcceptEncoding => { /* ... */ },
HeaderEnum::AcceptLanguage => { /* ... */ },
HeaderEnum::Authorization => { /* ... */ },
HeaderEnum::CloudFrontForwardedProto => { /* ... */ },
HeaderEnum::CloudFrontIsDesktopViewer => { /* ... */ },
HeaderEnum::CloudFrontIsMobileViewer => { /* ... */ },
HeaderEnum::CloudFrontIsSmartTvViewer => { /* ... */ },
HeaderEnum::CloudFrontIsTabletViewer => { /* ... */ },
HeaderEnum::CloudFrontViewerCountry => { /* ... */ },
HeaderEnum::Host => { /* ... */ },
HeaderEnum::Origin => { /* ... */ },
HeaderEnum::Referer => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when headerenum
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant HeaderEnum::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
HeaderEnum::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 HeaderEnum::NewFeature
is defined.
Specifically, when headerenum
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on HeaderEnum::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
Accept
AcceptCharset
AcceptDatetime
AcceptEncoding
AcceptLanguage
Authorization
CloudFrontForwardedProto
CloudFrontIsDesktopViewer
CloudFrontIsMobileViewer
CloudFrontIsSmartTvViewer
CloudFrontIsTabletViewer
CloudFrontViewerCountry
Host
Origin
Referer
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 HeaderEnum
impl HeaderEnum
source§impl HeaderEnum
impl HeaderEnum
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 HeaderEnum
impl AsRef<str> for HeaderEnum
source§impl Clone for HeaderEnum
impl Clone for HeaderEnum
source§fn clone(&self) -> HeaderEnum
fn clone(&self) -> HeaderEnum
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for HeaderEnum
impl Debug for HeaderEnum
source§impl Display for HeaderEnum
impl Display for HeaderEnum
source§impl From<&str> for HeaderEnum
impl From<&str> for HeaderEnum
source§impl FromStr for HeaderEnum
impl FromStr for HeaderEnum
source§impl Hash for HeaderEnum
impl Hash for HeaderEnum
source§impl Ord for HeaderEnum
impl Ord for HeaderEnum
source§fn cmp(&self, other: &HeaderEnum) -> Ordering
fn cmp(&self, other: &HeaderEnum) -> 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 HeaderEnum
impl PartialEq for HeaderEnum
source§fn eq(&self, other: &HeaderEnum) -> bool
fn eq(&self, other: &HeaderEnum) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for HeaderEnum
impl PartialOrd for HeaderEnum
source§fn partial_cmp(&self, other: &HeaderEnum) -> Option<Ordering>
fn partial_cmp(&self, other: &HeaderEnum) -> 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 HeaderEnum
impl StructuralPartialEq for HeaderEnum
Auto Trait Implementations§
impl Freeze for HeaderEnum
impl RefUnwindSafe for HeaderEnum
impl Send for HeaderEnum
impl Sync for HeaderEnum
impl Unpin for HeaderEnum
impl UnwindSafe for HeaderEnum
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