include/refid.h

   1 /*@
   2  * Copyright (c) 2014 - 2017 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   3  *
   4  * Copyright (C) 1989 - 1992 Free Software Foundation, Inc.
   5  *      Written by James Clark (jjc@jclark.com)
   6  *
   7  * This 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  * This 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 #ifndef _REFID_H
  22 #define _REFID_H
  23
  24 #include "config.h"
  25
  26 class reference_id
  27 {
  28   int filename_id;
  29   int pos;
  30
  31 public:
  32   reference_id() : filename_id(-1) { }
  33   reference_id(int fid, int off) : filename_id(fid), pos(off) { }
  34   unsigned hash() const { return (filename_id << 4) + pos; }
  35   int is_null() const { return filename_id < 0; }
  36   friend inline int operator==(const reference_id &, const reference_id &);
  37 };
  38
  39 inline int operator==(const reference_id &r1, const reference_id &r2)
  40 {
  41   return r1.filename_id == r2.filename_id && r1.pos == r2.pos;
  42 }
  43
  44 #endif // _REFID_H
  45 // s-it2-mode