// testInputRange;
import std.stdio;

struct Foo
{
	string[] data = ["hello", "world"];
	
	@property auto inputRange()
	{
		struct FooRange
		{
			private Foo foo;
			private size_t index=0;
			
			@property bool empty()
			{
				return index >= foo.data.length + 2;
			}
			
			@property string front()
			{
				if(index == 0)
					return "a";
				
				if(index == 1)
					return "b";
				
				return foo.data[index-2];
			}
			
			void popFront()
			{
				index++;
			}
		}
		
		return FooRange(this);
	}
}

void main()
{
	Foo foo;

	// Prints: a, b, hello, world
	foreach(item; foo.inputRange)
		writeln(item);
}