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

I know there is an accepted answer, but you can also use decltype in C++11 for this, it looks a bit messy...

stable_sort(X.rbegin(), X.rend(), [](decltype(*X.cbegin()) lhs, decltype(lhs) rhs) { return lhs.first < rhs.first; });

Use cbegin() here as you get the const correct value_type of the container.