#[non_exhaustive]pub enum ModelCompressionType {
Gzip,
None,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ModelCompressionType
, 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 modelcompressiontype = unimplemented!();
match modelcompressiontype {
ModelCompressionType::Gzip => { /* ... */ },
ModelCompressionType::None => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when modelcompressiontype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ModelCompressionType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ModelCompressionType::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 ModelCompressionType::NewFeature
is defined.
Specifically, when modelcompressiontype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ModelCompressionType::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
Gzip
None
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for ModelCompressionType
impl AsRef<str> for ModelCompressionType
source§impl Clone for ModelCompressionType
impl Clone for ModelCompressionType
source§fn clone(&self) -> ModelCompressionType
fn clone(&self) -> ModelCompressionType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ModelCompressionType
impl Debug for ModelCompressionType
source§impl From<&str> for ModelCompressionType
impl From<&str> for ModelCompressionType
source§impl FromStr for ModelCompressionType
impl FromStr for ModelCompressionType
source§impl Hash for ModelCompressionType
impl Hash for ModelCompressionType
source§impl Ord for ModelCompressionType
impl Ord for ModelCompressionType
source§fn cmp(&self, other: &ModelCompressionType) -> Ordering
fn cmp(&self, other: &ModelCompressionType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq<ModelCompressionType> for ModelCompressionType
impl PartialEq<ModelCompressionType> for ModelCompressionType
source§fn eq(&self, other: &ModelCompressionType) -> bool
fn eq(&self, other: &ModelCompressionType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<ModelCompressionType> for ModelCompressionType
impl PartialOrd<ModelCompressionType> for ModelCompressionType
source§fn partial_cmp(&self, other: &ModelCompressionType) -> Option<Ordering>
fn partial_cmp(&self, other: &ModelCompressionType) -> 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 ModelCompressionType
impl StructuralEq for ModelCompressionType
impl StructuralPartialEq for ModelCompressionType
Auto Trait Implementations§
impl RefUnwindSafe for ModelCompressionType
impl Send for ModelCompressionType
impl Sync for ModelCompressionType
impl Unpin for ModelCompressionType
impl UnwindSafe for ModelCompressionType
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> 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.