strange behavior with two similar cycles [duplicate]

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• What is the correct way of using C++11's range-based for? 3 answers

I'm using C++11, why is the first case working while the second needs auto&& ?

#include <vector>
#include <iostream>

struct Obj {
};

int main()
{
    std::vector<Obj> vobj(10);
    for (auto& e : vobj)       // Works
        std::cout << "Yes";

    std::vector<bool> v(10, false);
    for (auto& e : v)          // Fails
        e = true;
}