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