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+// Copyright 2008, 2009 Brady J. Garvin
+
+// This file is part of Covering Arrays by Simulated Annealing (CASA).
+
+// CASA is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// CASA is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with CASA.  If not, see <http://www.gnu.org/licenses/>.
+
+
+// Other SAT solvers can be substituted by altering SAT.H and SAT.C.
+
+#ifndef SAT_H
+#define SAT_H
+
+#include "Array.H"
+#include "Solver.H"
+
+// A literal in a SAT clause.
+class InputTerm {
+protected:
+  int					encoding;
+public:
+  InputTerm() :
+    encoding(0) {}
+  InputTerm(int encoding) :
+    encoding(encoding) {}
+  InputTerm(bool negated, int variable) :
+    encoding( (variable << 1) | (int)negated) {}
+
+  operator int() const {
+    return encoding;
+  }
+  InputTerm&operator =(int encoding) {
+    this->encoding = encoding;
+    return *this;
+  }
+
+  bool isNegated() const {
+    return encoding & 1;
+  }
+  int getVariable() const {
+    return encoding >> 1;
+  }
+};
+
+// A SAT clause.
+class InputClause {
+protected:
+  int					maxVariable;
+  vec<Lit>				literals;
+public:
+  InputClause();
+  InputClause(Array<InputTerm>terms);
+  InputClause(Array<unsigned>symbols);
+  virtual ~InputClause();
+
+  operator vec<Lit>&();
+  operator const vec<Lit>&() const;
+
+  int getMaxVariable() const {
+    return maxVariable;
+  }
+
+  void clear();
+  void append(InputTerm term);
+  void undoAppend();
+};
+
+// A partial assignment.
+typedef InputClause InputKnown;
+
+// A solver-wrapping class.
+class SATSolver {
+protected:
+  // The miniSAT implementation.
+  Solver				solver;
+public:
+  void reserve(int variables);
+  void addClause(InputClause&clause);
+  bool operator ()(const InputKnown&known);
+};
+
+#endif