io_format.h

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#ifndef IO_FORMAT_INCLUDED
#define IO_FORMAT_INCLUDED


namespace IO_Format {
  class Format {
   public:
    virtual ~Format() {}

    virtual int nin() const = 0;
    virtual int nex() const = 0;

    virtual void file_to_field(int& s, int& t, const int i, const int j) const = 0;
  };

  class Trivial_Format : public Format {
   public:
    virtual ~Trivial_Format() {}

    virtual int nin() const { return 0; }
    virtual int nex() const { return 0; }

    virtual void file_to_field(int& s, int& t, const int i, const int j) const
    {
      s = i;
      t = j;
    }
  };

//----------------------------------------------------------------
// predefined formats

  extern const Format *Trivial;

//----------------------------------------------------------------
}
#endif /* IO_FORMAT_INCLUDED */