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more/io/directory.h

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//  Copyright (C) 1999--2001  Petter Urkedal (petter.urkedal@matfys.lth.se)
//
//  This file is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This file is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//  As a special exception, you may use this file as part of a free
//  software library without restriction.  Specifically, if other files
//  instantiate templates or use macros or inline functions from this
//  file, or you compile this file and link it with other files to
//  produce an executable, this file does not by itself cause the
//  resulting executable to be covered by the GNU General Public
//  License.  This exception does not however invalidate any other
//  reasons why the executable file might be covered by the GNU General
//  Public License.
//
//  $Id: directory.h,v 1.1 2002/05/30 18:01:37 petter_urkedal Exp $


#ifndef MORE_IO_DIRECTORY_H
#define MORE_IO_DIRECTORY_H


#include <string>
#include <iterator>
#include <more/gen/utility.h>

namespace more {
namespace io {

  
  /** \class directory directory.h more/io/directory.h
   ** A type which provides a range over file names in a directory. */
  struct directory
  {
      explicit directory(std::string name_) : name(name_) {}

      struct iterator : std::iterator<std::input_iterator_tag, std::string>
      {
          explicit iterator(std::string);
          iterator() : dir(0) {}
          iterator(iterator const& u)
              : ic(u.ic), dir(u.dir), entry(u.entry) {}
          ~iterator();
          iterator& operator++() { getnext(); return *this; }
          iterator operator++(int)
          { iterator tmp = *this; getnext(); return tmp; }
          bool operator==(iterator const& rhs) const
          { return dir == 0 && rhs.dir == 0; }
          bool operator!=(iterator const& rhs) const
          { return !(*this == rhs); }
          std::string operator*() const { return entry; }
          std::string const* operator->() const { return &entry; }
        private:
          void getnext();
          gen::instance_counter ic;
          void* dir;
          std::string entry;
      };

      iterator begin() { return iterator(name); }
      iterator end() { return iterator(); }

    private:
      std::string name;
  };

}}

#endif

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