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