RhodeCode

      r._id = _addRowId(_addRow(l - *e, ExprIterator(e.comps.begin(), cols),

                                ExprIterator(e.comps.end(), cols), u - *e));

      return r;

    }

    ///Add a new row (i.e a new constraint) to the LP

    ///\param c is a linear expression (see \ref Constr)

    ///\return The created row.

    Row addRow(const Constr &c) {

      Row r;

      c.expr().simplify();

                                ExprIterator(c.expr().comps.begin(), cols),

                                ExprIterator(c.expr().comps.end(), cols),

      return r;

    }

    ///Erase a column (i.e a variable) from the LP

    ///\param c is the column to be deleted

    void erase(Col c) {

      _eraseCol(cols(id(c)));

      _eraseColId(cols(id(c)));

    }

    ///Erase a row (i.e a constraint) from the LP

    ///\param r is the row to be deleted