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

template<class TFirst>
void string_format(boost::format& fmt, TFirst&& first)
{
    fmt% first;
}

template<class TFirst, class... TOther>
void string_format(boost::format& fmt, TFirst&& first, TOther&&... other)
{
    fmt% first;
    string_format(fmt, other...);
}

template<class TFirst, class... TOther>
std::string string_format(const char* format, TFirst&& first, TOther&&... other)
{
    boost::format fmt(format);
    string_format(fmt, first, other...);
    return fmt.str();
}