#[non_exhaustive]
pub enum TargetPlatformArch {
Arm64,
ArmEabi,
ArmEabihf,
X86,
X8664,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TargetPlatformArch
, 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 targetplatformarch = unimplemented!();
match targetplatformarch {
TargetPlatformArch::Arm64 => { /* ... */ },
TargetPlatformArch::ArmEabi => { /* ... */ },
TargetPlatformArch::ArmEabihf => { /* ... */ },
TargetPlatformArch::X86 => { /* ... */ },
TargetPlatformArch::X8664 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when targetplatformarch
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TargetPlatformArch::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TargetPlatformArch::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 TargetPlatformArch::NewFeature
is defined.
Specifically, when targetplatformarch
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TargetPlatformArch::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
Arm64
ArmEabi
ArmEabihf
X86
X8664
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for TargetPlatformArch
impl AsRef<str> for TargetPlatformArch
source§impl Clone for TargetPlatformArch
impl Clone for TargetPlatformArch
source§fn clone(&self) -> TargetPlatformArch
fn clone(&self) -> TargetPlatformArch
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TargetPlatformArch
impl Debug for TargetPlatformArch
source§impl From<&str> for TargetPlatformArch
impl From<&str> for TargetPlatformArch
source§impl FromStr for TargetPlatformArch
impl FromStr for TargetPlatformArch
source§impl Hash for TargetPlatformArch
impl Hash for TargetPlatformArch
source§impl Ord for TargetPlatformArch
impl Ord for TargetPlatformArch
source§fn cmp(&self, other: &TargetPlatformArch) -> Ordering
fn cmp(&self, other: &TargetPlatformArch) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<TargetPlatformArch> for TargetPlatformArch
impl PartialEq<TargetPlatformArch> for TargetPlatformArch
source§fn eq(&self, other: &TargetPlatformArch) -> bool
fn eq(&self, other: &TargetPlatformArch) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<TargetPlatformArch> for TargetPlatformArch
impl PartialOrd<TargetPlatformArch> for TargetPlatformArch
source§fn partial_cmp(&self, other: &TargetPlatformArch) -> Option<Ordering>
fn partial_cmp(&self, other: &TargetPlatformArch) -> 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 TargetPlatformArch
impl StructuralEq for TargetPlatformArch
impl StructuralPartialEq for TargetPlatformArch
Auto Trait Implementations§
impl RefUnwindSafe for TargetPlatformArch
impl Send for TargetPlatformArch
impl Sync for TargetPlatformArch
impl Unpin for TargetPlatformArch
impl UnwindSafe for TargetPlatformArch
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.