std::swap (非メンバ関数)(C++11)

namespace std {
  void swap(thread& x, thread& y) noexcept;
}

#include <thread>

int main()
{
  std::thread t1([]{ /*...*/ });
  std::thread t2;

  std::swap(t1, t2);

  t2.join();

  return 0;
}