import std.stdio, std.datetime, std.parallelism, core.thread;

struct cArr {

	int[] Array;

	void calc() {

		long result = 0;
		foreach (num; Array) {
			Thread.sleep(dur!("msecs")(50));
			result += num;
		}

		writeln(result);
	}
}

void performMultithreading() {

	auto currTime = Clock.currTime();

	int[][] arr = [
		[500, 500, 500],
		[500, 500, 500],
		[500, 500, 500],
		[500, 500, 500]
	];

	auto datas = [cArr(arr[0]), cArr(arr[1]), cArr(arr[2]), cArr(arr[3])];

	foreach (data; parallel(datas))
		data.calc();

	writeln("Duration with multithreading: ", Clock.currTime() - currTime);
}


void performSinglethreading() {

	auto currTime = Clock.currTime();

	int[][] arr = [
		[500, 500, 500],
		[500, 500, 500],
		[500, 500, 500],
		[500, 500, 500]
	];

	auto datas = [cArr(arr[0]), cArr(arr[1]), cArr(arr[2]), cArr(arr[3])];

	foreach (data; datas)
		data.calc();

	writeln("Duration with singlethreading: ", Clock.currTime() - currTime);
}

void main() {

	performSinglethreading();
	performMultithreading();
}