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