#[non_exhaustive]pub enum DeleteResources {
All,
Default,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against DeleteResources
, 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 deleteresources = unimplemented!();
match deleteresources {
DeleteResources::All => { /* ... */ },
DeleteResources::Default => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when deleteresources
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant DeleteResources::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
DeleteResources::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 DeleteResources::NewFeature
is defined.
Specifically, when deleteresources
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on DeleteResources::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
All
Default
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
Source§impl DeleteResources
impl DeleteResources
Sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
Source§impl AsRef<str> for DeleteResources
impl AsRef<str> for DeleteResources
Source§impl Clone for DeleteResources
impl Clone for DeleteResources
Source§fn clone(&self) -> DeleteResources
fn clone(&self) -> DeleteResources
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for DeleteResources
impl Debug for DeleteResources
Source§impl Display for DeleteResources
impl Display for DeleteResources
Source§impl From<&str> for DeleteResources
impl From<&str> for DeleteResources
Source§impl FromStr for DeleteResources
impl FromStr for DeleteResources
Source§impl Hash for DeleteResources
impl Hash for DeleteResources
Source§impl Ord for DeleteResources
impl Ord for DeleteResources
Source§fn cmp(&self, other: &DeleteResources) -> Ordering
fn cmp(&self, other: &DeleteResources) -> 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 DeleteResources
impl PartialEq for DeleteResources
Source§impl PartialOrd for DeleteResources
impl PartialOrd for DeleteResources
impl Eq for DeleteResources
impl StructuralPartialEq for DeleteResources
Auto Trait Implementations§
impl Freeze for DeleteResources
impl RefUnwindSafe for DeleteResources
impl Send for DeleteResources
impl Sync for DeleteResources
impl Unpin for DeleteResources
impl UnwindSafe for DeleteResources
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