C++ Sorting objects based on two data members

Question

I understand you can insert a user-defined class in to a std::vector and then overload the sorting mechanism so that it compares on a particular data member. Ho

Answer 1

Create a custom comparator using std::tuple

    #include <tuple>
   //..    
    struct comp
    {
      bool operator()(const MyClass& lhs, const MyClass& rhs) const
      {
        return std::tie(lhs.a, lhs.b) < std::tie(rhs.a, rhs.b);
      }
    };

It will use a first and then b second