throws! is a macro for easy creation per-function error enums.
throws!(FileDoubleError = Io(io::Error), Parse(ParseIntError));
fn file_double(path: &str) -> Result<i32, FileDoubleError> {
let mut file = File::open(path)?;
let mut contents = String::new();
file.read_to_string(&mut contents)?;
let n: i32 = contents.trim().parse()?;
Ok(2 * n)
}For more, check out the examples directory!
You can run an individual example using cargo run --example example-name.
If you're using cargo, just add throws to your Cargo.toml:
[dependencies]
throws = "*"Otherwise, cargo build, and the rlib will be in your target directory.
MIT