Function last_write_time

include/boost/filesystem/operations.hpp:580–581

  path initial_path(system::error_code& ec) {return detail::initial_path(&ec);}

  inline
  std::time_t last_write_time(const path& p) {return detail::last_write_time(p);}

  inline
  std::time_t last_write_time(const path& p, system::error_code& ec)