// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
     Written by James Clark (jjc@jclark.com)

This file is part of groff.

groff 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 2, or (at your option) any later
version.

groff 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 groff; see the file COPYING.  If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

class reference_id {
  int filename_id;
  int pos;
public:
  reference_id() : filename_id(-1) { }
  reference_id(int fid, int off) : filename_id(fid), pos(off) { }
  unsigned hash() const { return (filename_id << 4) + pos; }
  int is_null() const { return filename_id < 0; }
  friend inline int operator==(const reference_id &, const reference_id &);
};

inline int operator==(const reference_id &r1, const reference_id &r2)
{
  return r1.filename_id == r2.filename_id && r1.pos == r2.pos;
}