Struct scale_encode::Variant
source · pub struct Variant<'a, Vals> {
pub name: &'a str,
pub fields: Composite<Vals>,
}
Expand description
This type represents named or unnamed composite values, and can be used
to help generate EncodeAsType
impls. It’s primarily used by the exported
macros to do just that.
use scale_encode::{ Error, EncodeAsType, Composite, Variant, PortableRegistry };
enum MyType {
SomeField(bool),
OtherField { foo: u64, bar: String }
}
impl EncodeAsType for MyType {
fn encode_as_type_to(&self, type_id: u32, types: &PortableRegistry, out: &mut Vec<u8>) -> Result<(), Error> {
match self {
MyType::SomeField(b) => Variant {
name: "SomeField",
fields: Composite([
(None, b as &dyn EncodeAsType),
].into_iter())
}.encode_as_type_to(type_id, types, out),
MyType::OtherField { foo, bar } => Variant {
name: "OtherField",
fields: Composite([
(Some("foo"), foo as &dyn EncodeAsType),
(Some("bar"), bar as &dyn EncodeAsType)
].into_iter())
}.encode_as_type_to(type_id, types, out)
}
}
}
Fields§
§name: &'a str
The name of the variant we’ll try to encode into.
fields: Composite<Vals>
The fields of the variant that we wish to encode.
Trait Implementations§
source§impl<'a, Vals> EncodeAsType for Variant<'a, Vals>where
Vals: ExactSizeIterator<Item = (Option<&'a str>, &'a dyn EncodeAsType)> + Clone,
impl<'a, Vals> EncodeAsType for Variant<'a, Vals>where Vals: ExactSizeIterator<Item = (Option<&'a str>, &'a dyn EncodeAsType)> + Clone,
source§fn encode_as_type_to(
&self,
type_id: u32,
types: &PortableRegistry,
out: &mut Vec<u8>
) -> Result<(), Error>
fn encode_as_type_to( &self, type_id: u32, types: &PortableRegistry, out: &mut Vec<u8> ) -> Result<(), Error>
Given some
type_id
, types
, a context
and some output target for the SCALE encoded bytes,
attempt to SCALE encode the current value into the type given by type_id
.source§fn encode_as_type(
&self,
type_id: u32,
types: &PortableRegistry
) -> Result<Vec<u8>, Error>
fn encode_as_type( &self, type_id: u32, types: &PortableRegistry ) -> Result<Vec<u8>, Error>
This is a helper function which internally calls
EncodeAsType::encode_as_type_to
. Prefer to
implement that instead.Auto Trait Implementations§
impl<'a, Vals> RefUnwindSafe for Variant<'a, Vals>where Vals: RefUnwindSafe,
impl<'a, Vals> Send for Variant<'a, Vals>where Vals: Send,
impl<'a, Vals> Sync for Variant<'a, Vals>where Vals: Sync,
impl<'a, Vals> Unpin for Variant<'a, Vals>where Vals: Unpin,
impl<'a, Vals> UnwindSafe for Variant<'a, Vals>where Vals: UnwindSafe,
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source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
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