#[non_exhaustive]pub enum StandardUnit {
Show 28 variants
Bits,
BitsSecond,
Bytes,
BytesSecond,
Count,
CountSecond,
Gigabits,
GigabitsSecond,
Gigabytes,
GigabytesSecond,
Kilobits,
KilobitsSecond,
Kilobytes,
KilobytesSecond,
Megabits,
MegabitsSecond,
Megabytes,
MegabytesSecond,
Microseconds,
Milliseconds,
None,
Percent,
Seconds,
Terabits,
TerabitsSecond,
Terabytes,
TerabytesSecond,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against StandardUnit
, 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 standardunit = unimplemented!();
match standardunit {
StandardUnit::Bits => { /* ... */ },
StandardUnit::BitsSecond => { /* ... */ },
StandardUnit::Bytes => { /* ... */ },
StandardUnit::BytesSecond => { /* ... */ },
StandardUnit::Count => { /* ... */ },
StandardUnit::CountSecond => { /* ... */ },
StandardUnit::Gigabits => { /* ... */ },
StandardUnit::GigabitsSecond => { /* ... */ },
StandardUnit::Gigabytes => { /* ... */ },
StandardUnit::GigabytesSecond => { /* ... */ },
StandardUnit::Kilobits => { /* ... */ },
StandardUnit::KilobitsSecond => { /* ... */ },
StandardUnit::Kilobytes => { /* ... */ },
StandardUnit::KilobytesSecond => { /* ... */ },
StandardUnit::Megabits => { /* ... */ },
StandardUnit::MegabitsSecond => { /* ... */ },
StandardUnit::Megabytes => { /* ... */ },
StandardUnit::MegabytesSecond => { /* ... */ },
StandardUnit::Microseconds => { /* ... */ },
StandardUnit::Milliseconds => { /* ... */ },
StandardUnit::None => { /* ... */ },
StandardUnit::Percent => { /* ... */ },
StandardUnit::Seconds => { /* ... */ },
StandardUnit::Terabits => { /* ... */ },
StandardUnit::TerabitsSecond => { /* ... */ },
StandardUnit::Terabytes => { /* ... */ },
StandardUnit::TerabytesSecond => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when standardunit
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant StandardUnit::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
StandardUnit::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 StandardUnit::NewFeature
is defined.
Specifically, when standardunit
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on StandardUnit::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
Bits
BitsSecond
Bytes
BytesSecond
Count
CountSecond
Gigabits
GigabitsSecond
Gigabytes
GigabytesSecond
Kilobits
KilobitsSecond
Kilobytes
KilobytesSecond
Megabits
MegabitsSecond
Megabytes
MegabytesSecond
Microseconds
Milliseconds
None
Percent
Seconds
Terabits
TerabitsSecond
Terabytes
TerabytesSecond
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 StandardUnit
impl StandardUnit
source§impl StandardUnit
impl StandardUnit
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 StandardUnit
impl AsRef<str> for StandardUnit
source§impl Clone for StandardUnit
impl Clone for StandardUnit
source§fn clone(&self) -> StandardUnit
fn clone(&self) -> StandardUnit
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for StandardUnit
impl Debug for StandardUnit
source§impl Display for StandardUnit
impl Display for StandardUnit
source§impl From<&str> for StandardUnit
impl From<&str> for StandardUnit
source§impl FromStr for StandardUnit
impl FromStr for StandardUnit
source§impl Hash for StandardUnit
impl Hash for StandardUnit
source§impl Ord for StandardUnit
impl Ord for StandardUnit
source§fn cmp(&self, other: &StandardUnit) -> Ordering
fn cmp(&self, other: &StandardUnit) -> 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 StandardUnit
impl PartialEq for StandardUnit
source§fn eq(&self, other: &StandardUnit) -> bool
fn eq(&self, other: &StandardUnit) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for StandardUnit
impl PartialOrd for StandardUnit
source§fn partial_cmp(&self, other: &StandardUnit) -> Option<Ordering>
fn partial_cmp(&self, other: &StandardUnit) -> 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 StandardUnit
impl StructuralPartialEq for StandardUnit
Auto Trait Implementations§
impl Freeze for StandardUnit
impl RefUnwindSafe for StandardUnit
impl Send for StandardUnit
impl Sync for StandardUnit
impl Unpin for StandardUnit
impl UnwindSafe for StandardUnit
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