Cstdatomic copy constructor hack

cstdatomic_hack.cpp

#if __GNUC__ == 4 && __GNUC_MINOR__ < 6
#include <cstdatomic>
#else
#include <atomic>
#endif

#include <vector>

struct S {
  std::atomic_int a;
  
  S() : a(0) {}
  
#ifdef COPY
  S(const S& s) : a(s.a.load()) {}
#endif

};

int main() {
  std::vector<S> v(10);
  v[0].a.store(1);
  return 0;
}