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