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tor> #include <functional> std::string to_lower(const std::string& str); template <typename T> std::string join(const T& values, const std::string& delim) { std::ostringstream ss; for (const auto& v : values) { if (&v != &values[0]) ss << delim; ss << v; } return ss.str(); } template <typename T> std::string join(const std::vector<T>& values, const std::string& delim, std::function<std::string(T)> func) { std::ostringstream ss; for (const auto& v : values) { if (&v != &values[0]) ss << delim; ss << func(v); } return ss.str(); } std::string sformat(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));