join.cc

#include <sstream>
#include <string>

template<typename T, typename U, typename... R>
void Join(std::stringstream& ss, const T& sep, const U& head, const R&... follows) {
	ss << head << sep;
	Join(ss, sep, follows...);
}

template<typename T, typename U>
void Join(std::stringstream& ss, const T& sep, const U& head) {
	ss << head;
}

template<typename T, typename U, typename... R>
std::string Join(const T& sep, const U& head, const R&... follows) {
	std::stringstream ss;
	Join(ss, sep, head, follows...);
	return ss.str();
}