Subj : Re: atomic operations api added to AppCore...
To   : comp.programming.threads
From : awaken
Date : Fri Feb 25 2005 09:08 am

>I don't think this would compile if AnchorType >doesn't have a
>constructor..

yes it have - I ommited it.
it's purpose only to initialize this 64bit structure

>Are you sure you don't need those two bits of >your pointer? Are you
sure
>you never forget to mask your pointer so you >take the two bits out and
>don't use corrupted pointers - ever?

I'm going to use wrapper class instead raw pointers whenever I can, so it
will take care about masking/unmasking
Of couse it's very hardware specific
It may look like this:

template <class T> class PackedPtr
{
   union
   {
      unsigned int dummy_bits:2;
      unsigned int ptr_:30;
   };
public:
   PackedPtr(): ptr_(0){};
   PackedPtr(const T& ptr)
   { 
      ptr_ = reinterpret_cast<unsigned int>(&ptr);
   }
   PackedPtr(const T* ptr)
   { 
      ptr_ = reinterpret_cast<unsigned int>(ptr);
   }
   PackedPtr& operator=(const T& ptr)
   {
      ptr_ = reinterpret_cast<unsigned int>(ptr);
			return ptr_;
   }
   T* operator->() const
   {
      return reinterpret_cast<T*>(ptr_);
   }
   operator T*()
   {
      return (reinterpret_cast<T*>(ptr_));
   }
};

.