Derive Macro sp_runtime_interface::pass_by::PassByEnum
source · #[derive(PassByEnum)]
Expand description
Derive macro for implementing PassBy
with the Enum
strategy.
Besides implementing PassBy
, this derive also implements TryFrom<u8>
and
From<Self> for u8
for the type.
The type is required to be an enum with only unit variants and at maximum 256
variants.
Also it is required that the type implements Copy
.
§Example
#[derive(PassByEnum, Copy, Clone)]
enum Data {
Okay,
NotOkay,
// This will not work with the derive.
//Why(u32),
}