Code shared from run.dlang.io.

main.d

import std.stdio;
import core.thread;

struct Player {
    int number;

    void parallel_op() {
        writefln("match %s has begun", number);

        // Wait for a while to simulate a long-lasting operation
        Thread.sleep(2.seconds);

        writefln("match %s has ended", number);
    }
}

void main() {
    auto players =  
        [ Player(1), Player(2), Player(3),Player(4) ];

    foreach (player; players) {
        player.parallel_op();
    }
}