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