backtrack.h

#ifndef BACKTRACK_H
#define BACKTRACK_H

class MoveState
{
public:  
  virtual bool reject()=0;
  virtual bool accept()=0;
  virtual MoveState* next()=0;

  //move "memory"
  virtual MoveState* before()=0;
  virtual MoveState* after()=0;
};

bool backtrack(MoveState *c);

#endif