@ -84,7 +84,7 @@ void Fprintf(std::ostream& out, const char* fmt, const Args&... args) {
}
template <typename... Args>
std::string Sprintf(const char* fmt = "", const Args&... args) {
std::string Sprintf(const char* fmt, const Args&... args) {
std::ostringstream oss;
Fprintf(oss, fmt, args...);
return oss.str();