Template. C++ to D

[Dennis Ritchie via Digitalmars-d-learn]

Hi.
How to rewrite this code on D?

#include <string>
#include <iostream>
template <typename T>
T foo(const T &val)
{
    return val;
}

template <typename T, typename ...U>
T foo(const T &val, const U &...u)
{
    return val + foo(u...);
}

int main()
{
    std::cout << foo(std::string("some "), std::string("test")) 
<< std::endl;	// prints some test
    std::cout << foo(2, 2, 1) << std::endl;         // prints 5
}