rust-ape-example/src/bin/flow_control_match_guard.rs

// ./src/flow_control/match/guard.md


enum Temperature {
    Celsius(i32),
    Fahrenheit(i32),
}

fn part0() {
    let temperature = Temperature::Celsius(35);
    // ^ TODO try different values for `temperature`

    match temperature {
        Temperature::Celsius(t) if t > 30 => println!("{}C is above 30 Celsius", t),
        // The `if condition` part ^ is a guard
        Temperature::Celsius(t) => println!("{}C is below 30 Celsius", t),

        Temperature::Fahrenheit(t) if t > 86 => println!("{}F is above 86 Fahrenheit", t),
        Temperature::Fahrenheit(t) => println!("{}F is below 86 Fahrenheit", t),
    }
}

fn part1() {
    let number: u8 = 4;

    match number {
        i if i == 0 => println!("Zero"),
        i if i > 0 => println!("Greater than zero"),
        _ => unreachable!("Should never happen."),
        // TODO ^ uncomment to fix compilation
    }
}

pub fn main() {
	part0();
	part1();
}