C++11: Atomics: Flag Operations

C++11 added flag operations:
atomic_flag_test_and_set
atomic_flag_test_and_set_explicit
atomic_flag_clear
atomic_flag_clear_explicit

Here is an example:

#include <atomic>
#include <iostream>
using namespace std;

int main()
{
  atomic_flag memoryOrder = ATOMIC_FLAG_INIT;

  bool isMemoryOrderRelaxed=memoryOrder.test_and_set(memory_order_relaxed);
  bool isMemoryOrderConsume=memoryOrder.test_and_set(memory_order_consume);
  bool isMemoryOrderAcquire=memoryOrder.test_and_set(memory_order_acquire);
  bool isMemoryOrderRelease=memoryOrder.test_and_set(memory_order_release);
  bool isMemoryOrderAcqRel =memoryOrder.test_and_set(memory_order_acq_rel);
  bool isMemoryOrderSeqCst =memoryOrder.test_and_set(memory_order_seq_cst);

  cout << isMemoryOrderRelaxed << " ";
  cout << isMemoryOrderConsume << " ";
  cout << isMemoryOrderAcquire << " ";
  cout << isMemoryOrderRelease << " ";
  cout << isMemoryOrderAcqRel << " ";
  cout << isMemoryOrderSeqCst << " ";

  cout << endl;
  return 0;
}
// Output: 0 1 1 1 1 1

Reference: http://en.cppreference.com/w/cpp/atomic
                    http://en.cppreference.com/w/cpp/atomic/memory_order