gistfile1.cpp

  BOOST_FILESYSTEM_DECL
  bool create_directories(const path& p, system::error_code* ec)
  {
    if (p.empty() || exists(p))
    {
      if (!p.empty() && !is_directory(p))
      {
        if (ec == 0)
        BOOST_FILESYSTEM_THROW(filesystem_error(
            "boost::filesystem::create_directories", p,
            error_code(system::errc::file_exists, system::generic_category())));
        else ec->assign(system::errc::file_exists, system::generic_category());
      }
      return false;
    }

    // First create branch, by calling ourself recursively
    create_directories(p.parent_path(), ec);
    // Now that parent's path exists, create the directory
    create_directory(p, ec);
    return true;
  }