import std.parallelism;

​

__gshared string[] args;

​

int f(int a, int b)

  {

    if (args.length > 1)

      return a+b;

    else

      return a-b;

  }

​

int main(string[] a)

{

  args = a;

​

  auto res = taskPool.reduce!f([1, 2, 3]);

​

  return 0;

}