virtual void _setColLowerBound(int i, Value value) = 0;

     virtual void _setColLowerBound(int i, Value value) = 0;

     virtual void _setColUpperBound(int i, Value value) = 0;

     virtual void _setColUpperBound(int i, Value value) = 0;

     virtual void _setRowLowerBound(int i, Value value) = 0;

     virtual void _setRowLowerBound(int i, Value value) = 0;

     virtual void _setRowUpperBound(int i, Value value) = 0;

     virtual void _setRowUpperBound(int i, Value value) = 0;

     virtual void _setObjCoeff(int i, Value obj_coef) = 0;

     virtual void _setObjCoeff(int i, Value obj_coef) = 0;

     virtual SolveExitStatus _solve() = 0;

     virtual SolveExitStatus _solve() = 0;

     virtual Value _getPrimal(int i) = 0;

     virtual Value _getPrimal(int i) = 0;

     virtual Value _getPrimalValue() = 0;

     virtual Value _getPrimalValue() = 0;

     virtual SolutionStatus _getPrimalStatus() = 0;

     virtual SolutionStatus _getPrimalStatus() = 0;

     virtual void _setMax() = 0;

     virtual void _setMax() = 0;

     //Own protected stuff

     //Own protected stuff

     //Constant component of the objective function

     //Constant component of the objective function

     Value obj_const_comp;

     Value obj_const_comp;

   public:

   public:

     ///\e

     ///\e

     LpSolverBase() : obj_const_comp(0) {}

     LpSolverBase() : obj_const_comp(0) {}

     ///Set the objective function

     ///Set the objective function

     ///\param e is a linear expression of type \ref Expr.

     ///\param e is a linear expression of type \ref Expr.

     ///\bug The previous objective function is not cleared!

     ///\bug The previous objective function is not cleared!

     void setObj(Expr e) {

     void setObj(Expr e) {

       for (Expr::iterator i=e.begin(); i!=e.end(); ++i)

       for (Expr::iterator i=e.begin(); i!=e.end(); ++i)

 	objCoeff((*i).first,(*i).second);

 	objCoeff((*i).first,(*i).second);

       obj_const_comp=e.constComp();

       obj_const_comp=e.constComp();

     }

     }