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Update parse_pos_nonzero with alternate solution #3

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Update parse_pos_nonzero with alternate solution #3

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27 changes: 16 additions & 11 deletions exercises/error_handling/errors6.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,20 +26,25 @@ impl ParsePosNonzeroError {
}
}

fn parse_pos_nonzero(s: &str)
-> Result<PositiveNonzeroInteger, ParsePosNonzeroError>
fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError>
{
match s.parse() {
Ok(n) => {
match PositiveNonzeroInteger::new(n) {
Ok(n) => Ok(n),
Err(err) => Err(ParsePosNonzeroError::from_creation(err)),
}
}
Err(err) => Err(ParsePosNonzeroError::from_parse_int(err)),
}
// long way
// match s.parse() {
// Ok(n) => {
// match PositiveNonzeroInteger::new(n) {
// Ok(n) => Ok(n),
// Err(err) => Err(ParsePosNonzeroError::from_creation(err)),
// }
// }
// Err(err) => Err(ParsePosNonzeroError::from_parse_int(err)),
// }

// short way
let x: i64 = s.parse().map_err(ParsePosNonzeroError::from_parseint)?;
PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation)
}


// Don't change anything below this line.

#[derive(PartialEq, Debug)]
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