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