OstreamIterator.h

#ifndef _theplu_yat_utility_ostream_iterator_
#define _theplu_yat_utility_ostream_iterator_

// $Id: OstreamIterator.h 4250 2022-11-18 02:14:33Z peter $

/*
  Copyright (C) 2013, 2014 Peter Johansson
  Copyright (C) 2022 Jari Häkkinen

  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 "yat_assert.h"

#include <boost/iterator/function_output_iterator.hpp>

#include <functional>
#include <ostream>
#include <string>

namespace theplu {
namespace yat {
namespace utility {

  // private namespace
  namespace detail {

    template<typename T>
    class OstreamIteratorFunc : public std::unary_function<const T&, void>
    {
    public:
      OstreamIteratorFunc(void) : ostream_(NULL), pristine_(true) {}
      explicit OstreamIteratorFunc(std::ostream& os,
                                   const std::string& delimiter)
        : delimiter_(delimiter), ostream_(&os), pristine_(true) {}

      void operator()(const T& t)
      {
        YAT_ASSERT(ostream_);
        if (pristine_)
          pristine_ = false;
        else
          *ostream_ << delimiter_;
        *ostream_ << t;
      }

    private:
      std::string delimiter_;
      std::ostream* ostream_;
      bool pristine_;
      // using compiler generated copy
      // Func(const Func&);
      // Func& operator=(const Func&);
    };
  } // end of namespace detail


  template<typename T>
  class OstreamIterator :
    public boost::function_output_iterator<detail::OstreamIteratorFunc<T> >
  {
  public:
    OstreamIterator(void) {}

    explicit OstreamIterator(std::ostream& os, const std::string& delimiter="")
      : boost::function_output_iterator<detail::OstreamIteratorFunc<T> >(detail::OstreamIteratorFunc<T>(os, delimiter)) {}

  private:
    // Using compiler generated copy
    //OstreamIterator(const OstreamIterator&);
    //OstreamIterator& operator=(const OstreamIterator&);
  };

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

#endif