Resize a std::vector<std::atomic_bool> assigning true to all atomic bools

Question

I have a std::vector<std::atomic_bool> that I want to resize to some arbitrary n, wherein all newly created objects are assigned a value of true. The program will not build because resize() relies on the copy constructor of the data type, not its assignment operator. Is there any way to assign a default value to an atomic_bool or would I be stuck with using a loop and store()ing all the values?

What I've tried:

#include <atomic>
#include <vector>

class foo() {
public:
    std::vector<std::atomic_bool> vec;

    foo() {
        std::atomic_bool temp(true);

        vec.resize(100, std::atomic_bool(true)); //try 1

        vec.resize(100, temp); //try 2
    }
}

Answer 1

If T is neither copyable nor movable, then std::vector<T> cannot be resized. Period. In this case, you might want to consider std::deque.

std::deque<std::atomic_bool> D;
D.emplace_back(true);  // write a helper to do this 100 times if you want

However, note that a standard library container of atomics is not atomic; adding new elements to the container is not an atomic operation so you will probably have to protect the container with a mutex, which might eliminate any benefits of storing atomics inside.