[Rust]

hash!_sample.rs

fn main() {
    use std::collections::HashMap;

    //マクロの定義
    macro_rules! hash {
        ( $( $t:expr),* ) => {
            {
                let mut temp_hash = HashMap::new();
                $(
                    temp_hash.insert($t.0, $t.1);
                )*
                temp_hash
            }
        };
    }

    let result = hash![("apple", 2), ("banana", 1), ("orange", 4)];
    for (key, value) in result {
        println!("{}: {}", key, value);
        //banana: 1
        //orange: 4
        //apple: 2
    }
}