**** Code with tabs ****

class tab_expanding_output_filter : public output_filter {
public:
        explicit tab_expanding_output_filter(int tab_size = 8)
                : tab_size_(tab_size), col_no_(0)
                { assert(tab_size > 0); }

        template<typename Sink>
        void put(Sink& dest, int c)
                {
                        if (c == '\t') {
                                do {
                                        this->put(dest, ' ');
                                } while(col_no_ % tab_size_ != 0);
                        } else {
                                boost::iostreams::put(dest, c);
                                if (c == '\n')
                                        col_no_ = 0;
                                else
                                        ++col_no_;
                        }
                }
        templatetypename Sink
        void close(Sink&) { col_no_ = 0; }
private:
        int     tab_size_;
        int     col_no_;
};


**** Code with tabs replaced ****

class tab_expanding_output_filter : public output_filter {
public:
  explicit tab_expanding_output_filter(int tab_size = 8)
    : tab_size_(tab_size), col_no_(0)
    { assert(tab_size > 0); }

  template<typename Sink>
  void put(Sink& dest, int c)
    {
      if (c == '\t') {
        do {
          this->put(dest, ' ');
        } while(col_no_ % tab_size_ != 0);
      } else {
        boost::iostreams::put(dest, c);
        if (c == '\n')
          col_no_ = 0;
        else
          ++col_no_;
      }
    }
  template<typename Sink>
  void close(Sink&) { col_no_ = 0; }
private:
  int tab_size_;
  int col_no_;
};

Revised 20 May, 2004

© Copyright Jonathan Turkanis, 2004

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)