enum-code is a derive macro for enum types. This library generates code that associates error codes with error types. It can be used in conjunction with the thiserror crate. Developers can quickly retrieve error codes by calling the get_code method.
enum-code is published on Cargo and can be installed using:
$ cargo add enum-code
Add the Code attribute to the enum type:
```rust
enum TestError { #[code(1)] Tuple(String), #[code(2)] Struct { message: String }, #[code(3)] Simple, } ```
Code Generation
For the TestError enum above, an associated impl TestError struct is generated, which includes a get_code method that returns the corresponding error code based on the variant value.
rust
impl TestError {
pub const fn get_code(&self) -> u32 {
match self {
TestError::Tuple(..) => 1u32,
TestError::Struct { .. } => 2u32,
TestError::Simple => 3u32,
}
}
}
Retrieving Error Codes
Error codes can be retrieved by calling get_code:
rust
let err = TestError::Tuple("error message".to_owned());
let code = err.get_code();
println!("error code: {}", code); // should print 「error code: 1」
MIT