import std.thread; /// Import thread functions from the standard library
import std.stdio; /// Also import standard in/output functions

class UselessThread : Thread { /// Create a new class (custom variable type), derived from the Thread class from std.thread
	Thread p; /// This is a member variable of the new data type UselessThread, ask line or google for more info
	this(Thread parent) { /// constructor
		p=parent;
	}
	int run() {
		p.wait(); /// Wait until the parent thread exits
		return 0; /// then return and exit too.
	}
}

int main() { /// Our main function
	UselessThread yawn; /// Create a new variable of type UselessThread
	yawn = new UselessThread (Thread.getThis()); /// and assign to it a new object of the type UselessThread
	yawn.start(); /// Start the "yawn" thread.
	writefln("Counting seconds!");
	for (int i=1; i<=10; ++i) {
		yawn.wait(1000);
		writefln(i, " seconds passed!");
	}
	return 0;
}