не могу разобраться c boost.filesystem

path p ("./");
  try
  {
    if (exists(p))    // does p actually exist?
    {
      if (is_regular_file(p))        // is p a regular file?
        cout << p << " size is " << file_size(p) << '\n';
 
      else if (is_directory(p))      // is p a directory?
      {
        cout << p << " is a directory containing:\n";
 
        copy(directory_iterator(p), directory_iterator(),  // directory_iterator::value_type
          ostream_iterator<directory_entry>(cout, "\n"));  // is directory_entry, which is
                                                           // converted to a path by the
                                                           // path stream inserter
      }
      else
        cout << p << " exists, but is neither a regular file nor a directory\n";
    }
    else
      cout << p << " does not exist\n";
  }
 
  catch (const filesystem_error& ex)
  {
    cout << ex.what() << '\n';
  }

cout << p << " is a directory containing:\n";
            directory_entry arr[20];
            directory_iterator it(p), itEnd;
            int i;
            for(i = 0; it != itEnd; ++it, ++i)
            {
                arr[i] = *it;
                cout << arr[i] << endl;
            }
            cout << i << endl;
          }
          else
            cout << p << " exists, but is neither a regular file nor a directory\n";

        for (vec::const_iterator it(v.begin()), it_end(v.end()); it != it_end; ++it)
        {
          cout << "   " << *it << '\n';
        }

cout << p << " is a directory containing:\n";
            directory_iterator it(p), itEnd;
            std::vector<std::string> v;
            for(; it != itEnd; ++it)
            {
                v.emplace_back(it->path().string());
            }
            std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(std::cout, "\n"));

cout << p << " is a directory containing:\n";
            directory_iterator it(p), itEnd;
            std::vector<std::string> v;
            for(; it != itEnd; ++it)
            {
                v.emplace_back(it->path().string());
            }
            std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(std::cout, "\n"));

cout << p << " is a directory containing:\n";
            directory_iterator it(p), itEnd;
            std::vector<std::string> v;
            for(; it != itEnd; ++it)
            {
                v.emplace_back(it->path().string());
            }
            std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(std::cout, "\n"));

string a[i] = it->path().string();