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: reference_id()25 reference_id() : filename_id(-1) { } reference_id(int fid,int off)26 reference_id(int fid, int off) : filename_id(fid), pos(off) { } hash()27 unsigned hash() const { return (filename_id << 4) + pos; } is_null()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 } 36