#[non_exhaustive]
pub enum OutputType {
Float32,
Float64,
Int16,
Int32,
Uint16,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against OutputType
, 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 outputtype = unimplemented!();
match outputtype {
OutputType::Float32 => { /* ... */ },
OutputType::Float64 => { /* ... */ },
OutputType::Int16 => { /* ... */ },
OutputType::Int32 => { /* ... */ },
OutputType::Uint16 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when outputtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant OutputType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
OutputType::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 OutputType::NewFeature
is defined.
Specifically, when outputtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on OutputType::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
Float32
FLOAT32
Float64
FLOAT64
Int16
INT16
Int32
INT32
Uint16
UINT16
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for OutputType
impl AsRef<str> for OutputType
source§impl Clone for OutputType
impl Clone for OutputType
source§fn clone(&self) -> OutputType
fn clone(&self) -> OutputType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for OutputType
impl Debug for OutputType
source§impl From<&str> for OutputType
impl From<&str> for OutputType
source§impl FromStr for OutputType
impl FromStr for OutputType
source§impl Hash for OutputType
impl Hash for OutputType
source§impl Ord for OutputType
impl Ord for OutputType
source§fn cmp(&self, other: &OutputType) -> Ordering
fn cmp(&self, other: &OutputType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<OutputType> for OutputType
impl PartialEq<OutputType> for OutputType
source§fn eq(&self, other: &OutputType) -> bool
fn eq(&self, other: &OutputType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<OutputType> for OutputType
impl PartialOrd<OutputType> for OutputType
source§fn partial_cmp(&self, other: &OutputType) -> Option<Ordering>
fn partial_cmp(&self, other: &OutputType) -> 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 OutputType
impl StructuralEq for OutputType
impl StructuralPartialEq for OutputType
Auto Trait Implementations§
impl RefUnwindSafe for OutputType
impl Send for OutputType
impl Sync for OutputType
impl Unpin for OutputType
impl UnwindSafe for OutputType
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.