gnu/dist/groff/src/include/refid.h

   1 /*      $NetBSD$        */
   2
   3 // -*- C++ -*-
   4 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   5      Written by James Clark (jjc@jclark.com)
   6
   7 This file is part of groff.
   8
   9 groff is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 2, or (at your option) any later
  12 version.
  13
  14 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License along
  20 with groff; see the file COPYING.  If not, write to the Free Software
  21 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  22
  23 class reference_id {
  24   int filename_id;
  25   int pos;
  26 public:
  27   reference_id() : filename_id(-1) { }
  28   reference_id(int fid, int off) : filename_id(fid), pos(off) { }
  29   unsigned hash() const { return (filename_id << 4) + pos; }
  30   int is_null() const { return filename_id < 0; }
  31   friend inline int operator==(const reference_id &, const reference_id &);
  32 };
  33
  34 inline int operator==(const reference_id &r1, const reference_id &r2)
  35 {
  36   return r1.filename_id == r2.filename_id && r1.pos == r2.pos;
  37 }