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rust error handling

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Maou Shimazu answered on March 18, 2022 Popularity 10/10 Helpfulness 2/10

answer rust error handling

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rust error handling

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match do_steps() {
    Ok(_) => (),
    _ => alert_user("Failed to perform necessary steps")
}

// Additional function:
fn do_steps() -> Result<(), Error>{
    do_step_1()?;
    do_step_2()?;
    do_step_3()?;
    // etc
    Ok(())
}

Popularity 10/10 Helpfulness 2/10 Language rust

Source: Grepper

Tags: error-handling rust

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Contributed on Mar 18 2022

Maou Shimazu

0 Answers Avg Quality 2/10

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error handling rust

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fn main() {
    let c = div(2.0,0.0);
    match c {
        Ok(t)   =>  println!("c = {t}"),
        Err(e)  =>  println!("{e}")
    }
}

fn div(a:f32, b:f32) -> Result<f32, std::string::String> {
    if b==0.0 {
        let e = std::string::String::from("ZeroDevisionError: float division by zero");
        return Err(e)
    }
    return Ok(a/b)
}

Popularity 10/10 Helpfulness 2/10 Language rust

Source: Grepper

Tags: error-handling erro

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Contributed on May 05 2022

SnefDen

0 Answers Avg Quality 2/10

rust error

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// errorable functions should return Result<T, E>
// where T is your original return type, and E is the error type that impls std::error

// an error can be used in multiple ways (from a result)
// unwrap (do not use for production)

my_error.unwrap()

// an error can be used by using if let

if let Ok(x) = my_error {
	// do whatever success is here
    } else {
	// do error processing here    
}

// if the function also returns a result of a Result<T, Box<dyn Error>>
// you can use the following syntax "?" to propogate

fn errorable() -> Result<(), Box<dyn Error>> {
	my_error?
}

// finally, you can use the unwrap_or methods, which is safe

my_error.unwrap_or("default value")

Popularity 9/10 Helpfulness 1/10 Language rust

Source: Grepper

Tags: rust

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Contributed on Mar 05 2024

John Appleseed

0 Answers Avg Quality 2/10

rust error handling

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