sprintf with C++ variadic templates

format.cpp

#include <iostream>
#include <sstream>
#include <tuple>

template<class Tuple, std::size_t N>
struct TuplePrinter {
    static void print(const std::string& fmt, std::ostream& os, const Tuple& t) {
        const size_t idx = fmt.find_last_of('%');
        TuplePrinter<Tuple, N-1>::print(std::string(fmt, 0, idx), os,t);
        os << std::get<N-1>(t) << std::string(fmt, idx + 1);
    }
};

template<class Tuple>
struct TuplePrinter<Tuple, 1>{
    static void print(const std::string& fmt, std::ostream& os, const Tuple& t) {
        const size_t idx = fmt.find_first_of('%');
        os << std::string(fmt,0,idx) << std::get<0>(t) << std::string(fmt, idx +1);
    }
};

template<class... Args>
std::string format(const std::string& fmt, Args&&... args) {
    std::stringstream ss;
    const auto t = std::make_tuple(std::forward<Args>(args)...);
    TuplePrinter<decltype(t), sizeof...(Args)>::print(fmt, ss, t);
    return ss.str();
}

int main() {
   std::cout << format("% xyz %.", "Hello", "World") << std::endl;
   return 0;
}