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

const auto is not supported in C++11 as a lambda parameter (actually generic lambdas are not supported in C++11).

To fix:

using pair_type = std::pair>;
vector X;

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