What differences are between capturing by [&captured] and by [&local = captured] in lambdas?

Question

vector<int> vec;

//a
auto foo = [&vec](){
    //do something
};

//b
auto foo = [&v = vec](){
    //do something
};

Do I understand it right that only difference between a and b is creation of alias "v" for "vec" in b case or is there more to it?

Answer 1

In this case there is no real difference. However, if you were to capture by value there would be a difference:

const std::vector<int> vec; // note const

auto foo = [vec]() mutable {
   // can't change vec here since it is captured with cv-qualifiers
};

auto bar = [v = vec]() mutable {
    // can change v here since it is captured by auto deduction rules
    // (cv-qualifiers dropped)
};