1 /* 2 3 This file is part of the Maude 2 interpreter. 4 5 Copyright 1997-2008 SRI International, Menlo Park, CA 94025, USA. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 20 21 */ 22 23 // 24 // Abstract base class for the accumulation and simultaneous solution of subproblems during unification. 25 // 26 #ifndef _unificationSubproblem_hh_ 27 #define _unificationSubproblem_hh_ 28 29 class UnificationSubproblem 30 { 31 public: ~UnificationSubproblem()32 virtual ~UnificationSubproblem() {} // deep 33 addUnification(DagNode * lhs,DagNode * rhs,bool marked,UnificationContext & solution)34 virtual void addUnification(DagNode* lhs, DagNode* rhs, bool marked, UnificationContext& solution) { CantHappen("Not implemented " << lhs << " vs " << rhs); } solve(bool findFirst,UnificationContext & solution,PendingUnificationStack & pending)35 virtual bool solve(bool findFirst, UnificationContext& solution, PendingUnificationStack& pending) { CantHappen("Not implemented"); return false; } 36 37 #ifdef DUMP dump(ostream & s,const VariableInfo & variableInfo,int indentLevel=0)38 virtual void dump(ostream& s, 39 const VariableInfo& variableInfo, 40 int indentLevel = 0) {} // HACK 41 #endif 42 }; 43 44 #endif 45