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