simple_sorter(int index = 0, int value = 0) : _index(index), _value(value) {}
bool operator < (const simple_sorter &to_compare) const
{ return _value < to_compare._value; }
simple_sorter(int index = 0, int value = 0) : _index(index), _value(value) {}
bool operator < (const simple_sorter &to_compare) const
{ return _value < to_compare._value; }