[RUST/COMMON] Error 구조체 : kind 메소드를 사용해 서로 다른 에러 처리하기

icodebroker COMMON 2024-06-18

■ Error 구조체의 kind 메소드를 사용해 서로 다른 에러를 처리하는 방법을 보여준다.

▶ 예제 코드 (RS)


use std::fs;
use std::io;

let result : Result<fs::File, io::Error> = fs::File::open("hello.txt");

let file : fs::File = match result
{
    Ok(file) => file,
    Err(ref error) if error.kind() == io::ErrorKind::NotFound =>
    {
        match fs::File::create("hello.txt")
        {
            Ok(file2) => file2,
            Err(error2) =>
            {
                panic!("Tried to create file but there was a problem: {:?}", error2);
            }
        }
    },
    Err(error) =>
    {
        panic!("There was a problem opening the file: {:?}", error);
    }
};

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use std::fs;

use std::io;

let result : Result<fs::File, io::Error> = fs::File::open("hello.txt");

let file : fs::File = match result

{

Ok(file) => file,

Err(ref error) if error.kind() == io::ErrorKind::NotFound =>

{

match fs::File::create("hello.txt")

{

Ok(file2) => file2,

Err(error2) =>

{

panic!("Tried to create file but there was a problem: {:?}", error2);

}

},

Err(error) =>

{

panic!("There was a problem opening the file: {:?}", error);

}

};