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