README

http://www.zhihu.com/question/25037476/answer/30100671

mtx.cpp

class mutex {
 public:
  void acquire();
  void release();
};

template <class T>
class AtomicValue {
  T *p;
  mutex m;

 public:
  AtomicValue(const T &t)
    : p(new T(t))
  { }

  ~AtomicValue() {
    m.acquire();
    if (p) {
      delete p;
      p = 0;
    }
    m.release();
  }
};

void test() {
  AtomicValue<int> ai(5);
}