`values` function, taking a number of values with a common type and returning an aggregate containing the values in order, with a range interface. Useful when a few values need to be returned from a function as part of a range composition.

values.d

auto values(Elems...)(auto ref Elems elems) if(is(CommonType!Elems))
{
	alias CommonType!Elems ElemType;

	static struct StaticArray
	{
		ElemType[Elems.length] data = void;
		size_t i = 0;
		
		bool empty() const
		{
			return i == data.length;
		}
		
		ElemType front() const pure
		{
			return data[i];
		}
		
		void popFront() pure
		{
			++i;
		}
		
		enum length = data.length;
	}
	
	StaticArray arr;
	
	foreach(i, ref elem; elems)
		arr.data[i] = elem;
	
	return arr;
}

unittest
{
	import std.algorithm : joiner;
	
	assert(
	    values("one", "two", "three")
	    .joiner(" ")
	    .array() == "one two three");
}