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use num_traits::FromPrimitive;
pub trait DecodeError<E> {
fn decode_custom_error_to_enum(custom: u32) -> Option<E>
where
E: FromPrimitive,
{
E::from_u32(custom)
}
fn type_of() -> &'static str;
}
#[cfg(test)]
mod tests {
use super::*;
use num_derive::FromPrimitive;
#[test]
fn test_decode_custom_error_to_enum() {
#[derive(Debug, FromPrimitive, PartialEq)]
enum TestEnum {
A,
B,
C,
}
impl<T> DecodeError<T> for TestEnum {
fn type_of() -> &'static str {
"TestEnum"
}
}
assert_eq!(TestEnum::decode_custom_error_to_enum(0), Some(TestEnum::A));
assert_eq!(TestEnum::decode_custom_error_to_enum(1), Some(TestEnum::B));
assert_eq!(TestEnum::decode_custom_error_to_enum(2), Some(TestEnum::C));
let option: Option<TestEnum> = TestEnum::decode_custom_error_to_enum(3);
assert_eq!(option, None);
}
}