#[non_exhaustive]pub enum TimePointGranularity {
All,
Specific,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TimePointGranularity
, 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 timepointgranularity = unimplemented!();
match timepointgranularity {
TimePointGranularity::All => { /* ... */ },
TimePointGranularity::Specific => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when timepointgranularity
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TimePointGranularity::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TimePointGranularity::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 TimePointGranularity::NewFeature
is defined.
Specifically, when timepointgranularity
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TimePointGranularity::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
Specific
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 TimePointGranularity
impl TimePointGranularity
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 TimePointGranularity
impl AsRef<str> for TimePointGranularity
source§impl Clone for TimePointGranularity
impl Clone for TimePointGranularity
source§fn clone(&self) -> TimePointGranularity
fn clone(&self) -> TimePointGranularity
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TimePointGranularity
impl Debug for TimePointGranularity
source§impl Display for TimePointGranularity
impl Display for TimePointGranularity
source§impl From<&str> for TimePointGranularity
impl From<&str> for TimePointGranularity
source§impl FromStr for TimePointGranularity
impl FromStr for TimePointGranularity
source§impl Hash for TimePointGranularity
impl Hash for TimePointGranularity
source§impl Ord for TimePointGranularity
impl Ord for TimePointGranularity
source§fn cmp(&self, other: &TimePointGranularity) -> Ordering
fn cmp(&self, other: &TimePointGranularity) -> 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 TimePointGranularity
impl PartialEq for TimePointGranularity
source§fn eq(&self, other: &TimePointGranularity) -> bool
fn eq(&self, other: &TimePointGranularity) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for TimePointGranularity
impl PartialOrd for TimePointGranularity
source§fn partial_cmp(&self, other: &TimePointGranularity) -> Option<Ordering>
fn partial_cmp(&self, other: &TimePointGranularity) -> 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 TimePointGranularity
impl StructuralPartialEq for TimePointGranularity
Auto Trait Implementations§
impl Freeze for TimePointGranularity
impl RefUnwindSafe for TimePointGranularity
impl Send for TimePointGranularity
impl Sync for TimePointGranularity
impl Unpin for TimePointGranularity
impl UnwindSafe for TimePointGranularity
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> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more