167 bool signMatchesDirection(int64_t elem, Direction direction) {  in signMatchesDirection()  argument
169   return direction == Direction::Up ? elem > 0 : elem < 0;  in signMatchesDirection()
172 Direction flippedDirection(Direction direction) {  in flippedDirection()  argument
173   return direction == Direction::Up ? Direction::Down : Simplex::Direction::Up;  in flippedDirection()
856                                                 Direction direction) const {  in findPivot()
864         !signMatchesDirection(elem, direction))  in findPivot()
874       tableau(row, *col) < 0 ? flippedDirection(direction) : direction;  in findPivot()
1001                                          Direction direction,  in findPivotRow()  argument
1017     if (signMatchesDirection(elem, direction))  in findPivotRow()
1030         (diff != 0 && !signMatchesDirection(diff, direction))) {  in findPivotRow()
1311 MaybeOptimum<Fraction> Simplex::computeRowOptimum(Direction direction,  in computeRowOptimum()  argument
1314   while (Optional<Pivot> maybePivot = findPivot(row, direction)) {  in computeRowOptimum()
1330 MaybeOptimum<Fraction> Simplex::computeOptimum(Direction direction,  in computeOptimum()  argument
1338   return computeRowOptimum(direction, row);  in computeOptimum()
1341 MaybeOptimum<Fraction> Simplex::computeOptimum(Direction direction,  in computeOptimum()  argument
1347     Optional<unsigned> pivotRow = findPivotRow({}, direction, column);  in computeOptimum()
1356   MaybeOptimum<Fraction> optimum = computeRowOptimum(direction, row);  in computeOptimum()
1357   if (u.restricted && direction == Direction::Down &&  in computeOptimum()