BinaryIstreamIterator.h

#ifndef _theplu_yat_utility_binary_istream_iterator_
#define _theplu_yat_utility_binary_istream_iterator_

// $Id: BinaryIstreamIterator.h 3902 2020-05-05 02:17:54Z peter $

/*
  Copyright (C) 2020 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library 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 3 of the
  License, or (at your option) any later version.

  The yat library 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 yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "utility.h"

#include <boost/iterator/iterator_facade.hpp>

#include <iterator>

namespace theplu {
namespace yat {
namespace utility {

  template<typename T>
  class BinaryIstreamIterator
    : public boost::iterator_facade<
    BinaryIstreamIterator<T>, const T, std::input_iterator_tag
    >
  {
  public:
    BinaryIstreamIterator(void)
      : istream_(NULL) {}

    explicit BinaryIstreamIterator(std::istream& is)
      : istream_(&is)
    {
      increment();
    }

  private:
    friend class boost::iterator_core_access;

    std::istream* istream_;
    T value_;

    typename BinaryIstreamIterator<T>::reference dereference(void) const
    { return value_; }

    bool equal(const BinaryIstreamIterator<T>& other) const
    { return istream_ == other.istream_; }

    void increment(void)
    {
      if (!istream_)
        return;
      if (!binary_read(*istream_, value_)) {
        istream_ = NULL;
      }
    }
    // Using compiler generated copy
    //BinaryIstreamIterator(const BinaryIstreamIterator&);
    //BinaryIstreamIterator& operator=(const BinaryIstreamIterator&);
  };

}}} // of namespace utility, yat, and theplu

#endif