source: trunk/yat/utility/ColumnStream.h @ 1887

#ifndef _theplu_yat__utility_column_stream_
#define _theplu_yat__utility_column_stream_

// $Id: ColumnStream.h 1887 2009-03-31 17:38:16Z peter $

/*
  Copyright (C) 2007, 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2009 Peter Johansson

  This file is part of svndigest, http://dev.thep.lu.se/svndigest

  svndigest 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.

  svndigest 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 <fstream>
#include <iostream>
#include <sstream>
#include <vector>

namespace theplu {
namespace yat {
namespace utility {

  ///
  /// ostream for sending to multiple columns 
  ///
  class ColumnStream
  {
  public:

    ///
    /// @brief Constructor
    ///
    ColumnStream(std::ostream& os, size_t columns);

    ///
    /// @brief Destructor
    ///
    ~ColumnStream(void);

    ///
    /// flush to ostream, goes to newline andactivates first column
    ///
    void flush(void);

    /**
       \return reference to margin of column \a c
     */
    size_t& margin(size_t c);

    /**
       \brief jump to next column
     */
    void next_column(void);

    ///
    /// \brief print to active column
    ///
    void print(std::stringstream&);

    ///
    /// \brief select which column is active
    ///
    void set_column(size_t);

    /**
       \return reference to width of column \a c
     */
    size_t& width(size_t c);

  private:
    ///
    /// @brief Copy Constructor, not implemented
    ///
    ColumnStream(const ColumnStream&);

    void fill(size_t, size_t);
    bool writeline(size_t i);
    inline size_t columns(void) const { return buffer_.size(); }
    

    size_t activated_;
    std::vector<size_t> margins_;
    std::ostream& os_;
    std::vector<std::stringstream*> buffer_;
    std::vector<size_t> width_;
  };


  /**
     \brief ColumnStream output operator

     Requirement: T should have operator
     operator<<(ostream&, const T&)

     \relates ColumnStream
   */
  template <typename T>
  ColumnStream& operator<<(ColumnStream& s, const T& rhs)
  {
    std::stringstream ss;
    ss << rhs;
    s.print(ss);
    return s;
  }

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

#endif