39 lines
1.0 KiB
Rust
39 lines
1.0 KiB
Rust
|
use num_traits::FromPrimitive;
|
||
|
|
|
||
|
|
/// Allows customer errors to be decoded back to their original enum
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
}
|