Function is_file

dependencies/httplib/httplib.h:1966–1973

}

inline bool is_file(const std::string &path) {
#ifdef _WIN32
  return _access_s(path.c_str(), 0) == 0;
#else
  struct stat st;
  return stat(path.c_str(), &st) >= 0 && S_ISREG(st.st_mode);
#endif
}

inline bool is_dir(const std::string &path) {
  struct stat st;