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