[RUST/COMMON] 함수 정의시 에러 전파하기

icodebroker COMMON 2024-06-18

■ 함수 정의시 에러를 전파하는 방법을 보여준다.

▶ 예제 코드 (RS)


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

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

    let mut file : fs::File = match result
    {
        Ok(file) => file,
        Err(e) => return Err(e)
    };

    let mut file_content : String = String::new();

    match file.read_to_string(&mut file_content)
    {
        Ok(_) => return Ok(file_content),
        Err(e) => return Err(e)
    };
}

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use std::fs;

use std::io;

use std::io::Read;

fn read_file() -> Result<String, io::Error>

{

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

let mut file : fs::File = match result

{

Ok(file) => file,

Err(e) => return Err(e)

};

let mut file_content : String = String::new();

match file.read_to_string(&mut file_content)

{

Ok(_) => return Ok(file_content),

Err(e) => return Err(e)

};

}