How to use lambda auto parameters in C++11

Question

I have a code in C++14. However, when I used it in C++11, it has an error at const auto. How to use it in C++11?

vector &g         


        

Answer 1

Alternatively you can directly use the value_type typedef of the container with a decltype, like

std::stable_sort(X.rbegin(), X.rend(),
                 [](const decltype(X)::value_type & lhs, 
                    const decltype(X)::value_type & rhs)
                    {return lhs.first < rhs.first; }
                );