std::tuple to string, using boost::format

format_tuple.cpp

#include <iostream>
#include <boost/format.hpp>
#include <tuple>

template<uint N, uint MAX, typename... Args> struct tuple_formatter {
    static void format_tuple(boost::format &fmt, const std::tuple<Args...>& args) {
        fmt % std::get<N>(args);
        tuple_formatter<N+1,MAX,Args...>::format_tuple(fmt, args);
    }
};

template<uint MAX, typename... Args> struct tuple_formatter<MAX,MAX,Args...> {
    static void format_tuple(boost::format &, const std::tuple<Args...>& ) {
    }
};

template<typename... Args> boost::format &format_with_tuple(boost::format &fmt, const std::tuple<Args...>& args) {
    tuple_formatter<0, sizeof...(Args), Args...>::format_tuple(fmt, args);
    return fmt;
}

int main() {
    boost::format tmp("%3% %1% %2%");
    std::cout << boost::str(format_with_tuple(tmp, std::make_tuple("omg", 45, 3.1415))) << "\n";
}