#[non_exhaustive]
pub enum TableBorderStyle {
None,
Solid,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TableBorderStyle
, 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 tableborderstyle = unimplemented!();
match tableborderstyle {
TableBorderStyle::None => { /* ... */ },
TableBorderStyle::Solid => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when tableborderstyle
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TableBorderStyle::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TableBorderStyle::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 TableBorderStyle::NewFeature
is defined.
Specifically, when tableborderstyle
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TableBorderStyle::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
None
Solid
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for TableBorderStyle
impl AsRef<str> for TableBorderStyle
source§impl Clone for TableBorderStyle
impl Clone for TableBorderStyle
source§fn clone(&self) -> TableBorderStyle
fn clone(&self) -> TableBorderStyle
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TableBorderStyle
impl Debug for TableBorderStyle
source§impl From<&str> for TableBorderStyle
impl From<&str> for TableBorderStyle
source§impl FromStr for TableBorderStyle
impl FromStr for TableBorderStyle
source§impl Hash for TableBorderStyle
impl Hash for TableBorderStyle
source§impl Ord for TableBorderStyle
impl Ord for TableBorderStyle
source§fn cmp(&self, other: &TableBorderStyle) -> Ordering
fn cmp(&self, other: &TableBorderStyle) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<TableBorderStyle> for TableBorderStyle
impl PartialEq<TableBorderStyle> for TableBorderStyle
source§fn eq(&self, other: &TableBorderStyle) -> bool
fn eq(&self, other: &TableBorderStyle) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<TableBorderStyle> for TableBorderStyle
impl PartialOrd<TableBorderStyle> for TableBorderStyle
source§fn partial_cmp(&self, other: &TableBorderStyle) -> Option<Ordering>
fn partial_cmp(&self, other: &TableBorderStyle) -> 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 TableBorderStyle
impl StructuralEq for TableBorderStyle
impl StructuralPartialEq for TableBorderStyle
Auto Trait Implementations§
impl RefUnwindSafe for TableBorderStyle
impl Send for TableBorderStyle
impl Sync for TableBorderStyle
impl Unpin for TableBorderStyle
impl UnwindSafe for TableBorderStyle
Blanket Implementations§
source§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,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.