gistfile1.txt

import std.datetime;
import core.thread;
import std.stdio;
auto now()=>Clock.currTime;
auto sleep(int i)=>Thread.sleep( dur!("seconds")(i));
alias time=typeof(now());
unittest{
	auto a=now;
	sleep(1);
	time b=now;
	(a-b).writeln;
}
struct timed(T,Duration dur){
	struct pair{
		T a;
		time t;
	}
	pair[] arr;
	auto opOpAssign(string s:"~")(T a) => arr~=pair(a,now);
	auto get(){
		import std.algorithm;
		auto F(pair p)=>now-p.t<dur;
		auto i=arr.countUntil!F;
		arr=arr[i==-1?$:i..$];
		return arr.map!"a.a";
	}
}
unittest{
	timed!(int,dur!"seconds"(3)) foo;
	foreach(i;0..5){
		foo~=i;
		sleep(1);
		foo.get.writeln;
	}
	sleep(5);
	foo.get.writeln;
}