[boost] shared_ptr question

From: Andrew Shiels (aeshiels_at_[hidden])
Date: 2004-07-29 16:05:22

Im very new to boost, and have just started to intergrate the shared_ptr smart pointer into one of my applications. I am storing a lot of pointers (to objects) in a std::vector.

typedef boost::shared_ptr<CMyClass> my_shared_ptr;
typedef std::vector<my_shared_ptr> my_shared_ptr_vector;

What i need to do is to additionally store a reference to the same objects
(in the vector) in a CListCtrl (MFC). The CListCtrl allows you to associate
a pointer with each item (row) in the list control.

Before i used shared_ptr i used to add the data as below:

CMyClass pItem = new CMyClass();
my_vector->push_back(pItem);
CListCtrl::SetItemData->SetItemData(iItemNumber, (DWORD)pItem);

Now using shared_ptr (see below) i get a compiler error saying that it cannot convert from my_shared_ptr to DWORD.

my_shared_ptr myPtr (new CMyClass();
my_shared_ptr_vector->push_back(myPtr);
CListCtrl::SetItemData->SetItemData(iItemNumber, reinterpret_cast<DWORD_PTR>(myPtr));

My second question is if i was able to add the item data as ...

CListCtrl::SetItemData->SetItemData(iItemNumber, reinterpret_cast<DWORD_PTR>(myPtr));

      ...would the internal reference counter be incremented in shared_ptr?

 My vector may be destroyed before my CListCtrl and I dont want the item data to be deleted until both are out of scope.

Thanks

Andy