175584Sru// -*- C++ -*- 275584Sru/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. 375584Sru Written by James Clark (jjc@jclark.com) 475584Sru 575584SruThis file is part of groff. 675584Sru 775584Srugroff is free software; you can redistribute it and/or modify it under 875584Sruthe terms of the GNU General Public License as published by the Free 975584SruSoftware Foundation; either version 2, or (at your option) any later 1075584Sruversion. 1175584Sru 1275584Srugroff is distributed in the hope that it will be useful, but WITHOUT ANY 1375584SruWARRANTY; without even the implied warranty of MERCHANTABILITY or 1475584SruFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1575584Srufor more details. 1675584Sru 1775584SruYou should have received a copy of the GNU General Public License along 1875584Sruwith groff; see the file COPYING. If not, write to the Free Software 19151497SruFoundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */ 2075584Sru 2175584Sruclass reference_id { 2275584Sru int filename_id; 2375584Sru int pos; 2475584Srupublic: 2575584Sru reference_id() : filename_id(-1) { } 2675584Sru reference_id(int fid, int off) : filename_id(fid), pos(off) { } 2775584Sru unsigned hash() const { return (filename_id << 4) + pos; } 2875584Sru int is_null() const { return filename_id < 0; } 2975584Sru friend inline int operator==(const reference_id &, const reference_id &); 3075584Sru}; 3175584Sru 3275584Sruinline int operator==(const reference_id &r1, const reference_id &r2) 3375584Sru{ 3475584Sru return r1.filename_id == r2.filename_id && r1.pos == r2.pos; 3575584Sru} 36