array_macro.rs

macro_rules! array {
    [$x: tt; $n: tt] => {array!(@go ($n, $x) -> ())};
    (@end $x: tt) => {$x};
    (@go (1, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@end [$($x,)* $($xs)*]) };
    (@go (2, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (1, $($x), *) -> ($($x,)* $($xs)*))};
    (@go (3, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (2, $($x), *) -> ($($x,)* $($xs)*))};
    (@go (4, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (2, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (5, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (4, $($x), *) -> ($($x,)* $($xs)*))};
    (@go (6, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (3, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (8, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (4, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (10, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (5, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (12, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (6, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (16, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (8, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (24, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (12, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (25, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (24, $($x), *) -> ($($x,)* $($xs)*))};
    (@go (50, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (25, $($x,)* $($x), *) -> ($($xs)*))};
    (@go (100, $($x: tt), *) -> ($($xs: tt)*)) => {array!(@go (50, $($x,)* $($x), *) -> ($($xs)*))};
}


#[test]
fn test() {
    let a: [String; 100] = array![{ format!["はろー！"] }; 100];
    for s in a.iter() {
        assert_eq!("はろー！", s);
    }
}