// stub mutex_t: implement this for your operating system
struct mutex_t 
{ 
    void Acquire() {} 
    void Release() {} 
};
 
struct LockGuard
{
     LockGuard(mutex_t& mutex) : _ref(mutex) 
     { 
         _ref.Acquire();  // TODO operating system specific
     };
 
     ~LockGuard() 
     { 
          _ref.Release(); // TODO operating system specific
     }
   private:
     LockGuard(const LockGuard&); // or use c++0x ` = delete`
 
     mutex_t& _ref;
};
 
int main()
{
    mutex_t mtx;
 
    {
        LockGuard lock(mtx);
        // LockGuard copy(lock); // ERROR: constructor private
        // lock = LockGuard(mtx);// ERROR: no default assignment operator
    }
 
}
 

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