#[non_exhaustive]pub enum QueryTokenStandard {
Erc1155,
Erc20,
Erc721,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against QueryTokenStandard
, 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 querytokenstandard = unimplemented!();
match querytokenstandard {
QueryTokenStandard::Erc1155 => { /* ... */ },
QueryTokenStandard::Erc20 => { /* ... */ },
QueryTokenStandard::Erc721 => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when querytokenstandard
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant QueryTokenStandard::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
QueryTokenStandard::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 QueryTokenStandard::NewFeature
is defined.
Specifically, when querytokenstandard
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on QueryTokenStandard::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
Erc1155
Erc20
Erc721
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 QueryTokenStandard
impl QueryTokenStandard
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 QueryTokenStandard
impl AsRef<str> for QueryTokenStandard
Source§impl Clone for QueryTokenStandard
impl Clone for QueryTokenStandard
Source§fn clone(&self) -> QueryTokenStandard
fn clone(&self) -> QueryTokenStandard
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for QueryTokenStandard
impl Debug for QueryTokenStandard
Source§impl Display for QueryTokenStandard
impl Display for QueryTokenStandard
Source§impl From<&str> for QueryTokenStandard
impl From<&str> for QueryTokenStandard
Source§impl FromStr for QueryTokenStandard
impl FromStr for QueryTokenStandard
Source§impl Hash for QueryTokenStandard
impl Hash for QueryTokenStandard
Source§impl Ord for QueryTokenStandard
impl Ord for QueryTokenStandard
Source§fn cmp(&self, other: &QueryTokenStandard) -> Ordering
fn cmp(&self, other: &QueryTokenStandard) -> 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 QueryTokenStandard
impl PartialEq for QueryTokenStandard
Source§impl PartialOrd for QueryTokenStandard
impl PartialOrd for QueryTokenStandard
impl Eq for QueryTokenStandard
impl StructuralPartialEq for QueryTokenStandard
Auto Trait Implementations§
impl Freeze for QueryTokenStandard
impl RefUnwindSafe for QueryTokenStandard
impl Send for QueryTokenStandard
impl Sync for QueryTokenStandard
impl Unpin for QueryTokenStandard
impl UnwindSafe for QueryTokenStandard
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