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