src/include/refid.h

   1 // -*- C++ -*-
   2 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   3      Written by James Clark (jjc@jclark.com)
   4
   5 This file is part of groff.
   6
   7 groff is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  20
  21 class reference_id {
  22   int filename_id;
  23   int pos;
  24 public:
  25   reference_id() : filename_id(-1) { }
  26   reference_id(int fid, int off) : filename_id(fid), pos(off) { }
  27   unsigned hash() const { return (filename_id << 4) + pos; }
  28   int is_null() const { return filename_id < 0; }
  29   friend inline int operator==(const reference_id &, const reference_id &);
  30 };
  31
  32 inline int operator==(const reference_id &r1, const reference_id &r2)
  33 {
  34   return r1.filename_id == r2.filename_id && r1.pos == r2.pos;
  35 }