#[non_exhaustive]pub enum StreamingInstanceType {
Show 14 variants
G34xlarge,
G3sXlarge,
G4dn12xlarge,
G4dn16xlarge,
G4dn2xlarge,
G4dn4xlarge,
G4dn8xlarge,
G4dnXlarge,
G516xlarge,
G52xlarge,
G54xlarge,
G58xlarge,
G5Xlarge,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against StreamingInstanceType
, 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 streaminginstancetype = unimplemented!();
match streaminginstancetype {
StreamingInstanceType::G34xlarge => { /* ... */ },
StreamingInstanceType::G3sXlarge => { /* ... */ },
StreamingInstanceType::G4dn12xlarge => { /* ... */ },
StreamingInstanceType::G4dn16xlarge => { /* ... */ },
StreamingInstanceType::G4dn2xlarge => { /* ... */ },
StreamingInstanceType::G4dn4xlarge => { /* ... */ },
StreamingInstanceType::G4dn8xlarge => { /* ... */ },
StreamingInstanceType::G4dnXlarge => { /* ... */ },
StreamingInstanceType::G516xlarge => { /* ... */ },
StreamingInstanceType::G52xlarge => { /* ... */ },
StreamingInstanceType::G54xlarge => { /* ... */ },
StreamingInstanceType::G58xlarge => { /* ... */ },
StreamingInstanceType::G5Xlarge => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when streaminginstancetype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant StreamingInstanceType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
StreamingInstanceType::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 StreamingInstanceType::NewFeature
is defined.
Specifically, when streaminginstancetype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on StreamingInstanceType::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
G34xlarge
G3sXlarge
G4dn12xlarge
G4dn16xlarge
G4dn2xlarge
G4dn4xlarge
G4dn8xlarge
G4dnXlarge
G516xlarge
G52xlarge
G54xlarge
G58xlarge
G5Xlarge
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 StreamingInstanceType
impl StreamingInstanceType
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 StreamingInstanceType
impl AsRef<str> for StreamingInstanceType
source§impl Clone for StreamingInstanceType
impl Clone for StreamingInstanceType
source§fn clone(&self) -> StreamingInstanceType
fn clone(&self) -> StreamingInstanceType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for StreamingInstanceType
impl Debug for StreamingInstanceType
source§impl From<&str> for StreamingInstanceType
impl From<&str> for StreamingInstanceType
source§impl FromStr for StreamingInstanceType
impl FromStr for StreamingInstanceType
source§impl Hash for StreamingInstanceType
impl Hash for StreamingInstanceType
source§impl Ord for StreamingInstanceType
impl Ord for StreamingInstanceType
source§fn cmp(&self, other: &StreamingInstanceType) -> Ordering
fn cmp(&self, other: &StreamingInstanceType) -> 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 StreamingInstanceType
impl PartialEq for StreamingInstanceType
source§fn eq(&self, other: &StreamingInstanceType) -> bool
fn eq(&self, other: &StreamingInstanceType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for StreamingInstanceType
impl PartialOrd for StreamingInstanceType
source§fn partial_cmp(&self, other: &StreamingInstanceType) -> Option<Ordering>
fn partial_cmp(&self, other: &StreamingInstanceType) -> 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 StreamingInstanceType
impl StructuralEq for StreamingInstanceType
impl StructuralPartialEq for StreamingInstanceType
Auto Trait Implementations§
impl RefUnwindSafe for StreamingInstanceType
impl Send for StreamingInstanceType
impl Sync for StreamingInstanceType
impl Unpin for StreamingInstanceType
impl UnwindSafe for StreamingInstanceType
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.