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#include <iostream>
#include <atomic>
 
struct A {
	std::atomic_bool b = false;
};
 
int main()
{
	A a;
	std::cout << a.b;
	return 0;
}
 

prog.cpp:5:23: error: use of deleted function ‘std::atomic<bool>::atomic(const std::atomic<bool>&)’
  std::atomic_bool b = false;
                       ^~~~~
In file included from prog.cpp:2:0:
/usr/include/c++/6/atomic:66:5: note: declared here
     atomic(const atomic&) = delete;
     ^~~~~~
/usr/include/c++/6/atomic:70:15: note:   after user-defined conversion: constexpr std::atomic<bool>::atomic(bool)
     constexpr atomic(bool __i) noexcept : _M_base(__i) { }
               ^~~~~~

Standard output is empty