Question

I don’t know how to pass a custom sort behavior to a std::map in the following way:

Constructor(const std::function<bool(const Obj&, const Obj&)>& ac_xNewComparator)
: mNewMap(xNewComparator(/*...???....*/)) {}

How could I pass the comparator to the map?

Answer 1

class Test
{
public:

    Test(const std::function<bool (int x, const std::string& str)>& comparator)
        : m_map(comparator)
    {
    }

    std::map<int, std::string, std::function<bool (int x, const std::string& str)> > m_map;

};