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boxed traits

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This commit is contained in:
Surya 2021-07-09 15:01:58 +05:30
parent 5fc192bf5c
commit 302d222e25
1 changed files with 13 additions and 1 deletions
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14
exercises/error_handling/errors5.rs
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@ -10,6 +10,7 @@ use std::error;
use std::fmt; use std::fmt;
use std::num::ParseIntError; use std::num::ParseIntError;
type Result<T, E> = std::result::Result<T, Box<dyn E>>;
// TODO: update the return type of `main()` to make this compile. // TODO: update the return type of `main()` to make this compile.
fn main() -> Result<(), ParseIntError> { fn main() -> Result<(), ParseIntError> {
let pretend_user_input = "42"; let pretend_user_input = "42";
@ -18,6 +19,17 @@ fn main() -> Result<(), ParseIntError> {
Ok(()) Ok(())
} }
// impl From<CreationError> for ParseIntError{
// fn from(e: CreationError) -> ParseIntError{
// return ParseIntError::CreationError(e);
// }
// }
// impl From<ParseIntError> for CreationError{
// fn from(e: ParseIntError) -> CreationError{
// return CreationError::ParseIntError(e);
// }
// }
// Don't change anything below this line. // Don't change anything below this line.
#[derive(PartialEq, Debug)] #[derive(PartialEq, Debug)]
@ -34,7 +46,7 @@ impl PositiveNonzeroInteger {
match value { match value {
x if x < 0 => Err(CreationError::Negative), x if x < 0 => Err(CreationError::Negative),
x if x == 0 => Err(CreationError::Zero), x if x == 0 => Err(CreationError::Zero),
x => Ok(PositiveNonzeroInteger(x as u64)) x => Ok(PositiveNonzeroInteger(x as u64)),
} }
} }
} }