#[non_exhaustive]pub enum EcsEnvironmentFileType {
S3,
Unknown(UnknownVariantValue),
}Expand description
When writing a match expression against EcsEnvironmentFileType, 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 ecsenvironmentfiletype = unimplemented!();
match ecsenvironmentfiletype {
EcsEnvironmentFileType::S3 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when ecsenvironmentfiletype represents
NewFeature, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EcsEnvironmentFileType::NewFeature
in the current version of SDK. The reason is that the variable other,
created by the @ operator, is bound to
EcsEnvironmentFileType::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 EcsEnvironmentFileType::NewFeature is defined.
Specifically, when ecsenvironmentfiletype represents NewFeature,
the execution path will hit the second last match arm as before by virtue of
calling as_str on EcsEnvironmentFileType::NewFeature also yielding "NewFeature".
Explicitly matching on the Unknown variant should
be avoided for two reasons:
- The inner data
UnknownVariantValueis 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
S3
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 EcsEnvironmentFileType
impl EcsEnvironmentFileType
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 EcsEnvironmentFileType
impl AsRef<str> for EcsEnvironmentFileType
source§impl Clone for EcsEnvironmentFileType
impl Clone for EcsEnvironmentFileType
source§fn clone(&self) -> EcsEnvironmentFileType
fn clone(&self) -> EcsEnvironmentFileType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moresource§impl Debug for EcsEnvironmentFileType
impl Debug for EcsEnvironmentFileType
source§impl From<&str> for EcsEnvironmentFileType
impl From<&str> for EcsEnvironmentFileType
source§impl FromStr for EcsEnvironmentFileType
impl FromStr for EcsEnvironmentFileType
source§impl Hash for EcsEnvironmentFileType
impl Hash for EcsEnvironmentFileType
source§impl Ord for EcsEnvironmentFileType
impl Ord for EcsEnvironmentFileType
source§fn cmp(&self, other: &EcsEnvironmentFileType) -> Ordering
fn cmp(&self, other: &EcsEnvironmentFileType) -> 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 EcsEnvironmentFileType
impl PartialEq for EcsEnvironmentFileType
source§fn eq(&self, other: &EcsEnvironmentFileType) -> bool
fn eq(&self, other: &EcsEnvironmentFileType) -> bool
self and other values to be equal, and is used
by ==.source§impl PartialOrd for EcsEnvironmentFileType
impl PartialOrd for EcsEnvironmentFileType
source§fn partial_cmp(&self, other: &EcsEnvironmentFileType) -> Option<Ordering>
fn partial_cmp(&self, other: &EcsEnvironmentFileType) -> 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 EcsEnvironmentFileType
impl StructuralEq for EcsEnvironmentFileType
impl StructuralPartialEq for EcsEnvironmentFileType
Auto Trait Implementations§
impl RefUnwindSafe for EcsEnvironmentFileType
impl Send for EcsEnvironmentFileType
impl Sync for EcsEnvironmentFileType
impl Unpin for EcsEnvironmentFileType
impl UnwindSafe for EcsEnvironmentFileType
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.