#include <iostream>

using namespace std;

template <typename Res, typename ValType>

void Sum(Res& result, ValType& val)

{

result = result + val;

}

template <typename Res, typename First, typename... Rest>

void Sum(Res& result, First val1, Rest... numN)

{

result = result + val1; // use sizeof...(numN) to find number of variadic parameters

return Sum(result, numN ...);

}

int main()

{

double dResult = 0;

Sum (dResult, 3.14, 4.56, 1.1111);

cout << "dResult = " << dResult << endl;

string strResult;

Sum (strResult, "Hello ", "World");

cout << "strResult = " << strResult.c_str() << endl;

return 0;

}