Smart Pointers and other Pointer classes

. You can also find this and other articles at his web site at http://www.wizsoft.com/~poul/srs/

Because copy has different meaning with different classes, there are several pointer classes here.

  • Smart pointers classes. Replace the now obsolete CWizPtr, BaseMultiRefPtr, and MultiRefPtr.(I don't remove them for convenience only). No plain C/C++ pointers again!
    File SmartPointers.h defines the following classes:
    • CWizSmartPtr - trivial base class for all others;
    • CWizSafePtr - smart pointer class which basic garbage collections (i.e. knows to
      delete the pointer in destructor). From here and later every pointer class must hold a pointer allocated from heap only! Copy operator attaches the object to the pointer and then detaches it from previous pointer - "pessimistic shadow copy".
    • CWizSafeArray - simple array of objects.
    • CWizDuplPtr - implements deep copy semantics for copy constructor/operator.
      Requires from an object to have a copy constructor. No polymorphism.
    • CWizClonePtr - implements deep copy semantics for copy constructor/operator, with support for polymorphism in pointed object. Requires from an object to have a Clone() function. In the case of polymorphism a Clone() function must be virtual function returning pointer to the root of hierarchy.
      An example:

      class A
      {
      A(const A& a);
      virtual A* Clone() const { return new A(*this); }
      };

      class B
      {
      B(const B& a);
      virtual A* Clone() const { return new B(*this); }
      };

    • CWizBaseMultiRefPtr - Multiply pointer classes with reference counting and polymorphism.
      Class implements basic machinery of reference counting, but doesn't implement a counter.
      Class CWizMultiRefPtr uses int as counter (the simplest solution).
      Implement garbage collection with reference counting, shadow copy, polymorphism.
    • CWizCounterMultiRefPtr - optimized Multiply pointer classes with reference counting and polymorphism. Differs from CWizBaseMultiRefPtr in implementing reference counting,
      which shifted to the managed class itself. It minimizes memory fragmentation, but requires access to the managed classes, which is not always possible.
       

    File SmartPointersSerialize.h defines StoreSmartPtr() and LoadSmartPtr() functions for serializing to/from MFC CArchive.
    File SmartPointerArrays.h defines arrays of smart pointers. All arrays are derived from CArray of MFC.
    File SmartPointerArraysSerialize.h defines template function SerializeArray() for serializing to/from MFC CArchive.
    File SmartPointerArraysSort.h defines template function SerializeArray() for serializing to/from MFC CArchive.
    File SerializeVersion.h defines function SortSmartPrtArray().

  • Multiply pointer class with reference counting CWizMultiPtr.
    Designed to hold objects of one class (no polymorphism). Several pointers can point to the same object; the object deleted when destroying the last pointer to it. By the nature uses shallow copy.
    File MULTIPTR.H .


  • Comments

    • It's all MFC

      Posted by Legacy on 12/18/2001 12:00am

      Originally posted by: NMTop40

      And it doesn't work when I look at it in the window here (no new-lines)

      Reply
    • Error in example?

      Posted by Legacy on 10/24/2000 12:00am

      Originally posted by: Jesper Rug�rd

      Shouldn't B be declared:

      class B : public A
      {...}

      (or something like that?)

      Reply
    Leave a Comment
    • Your email address will not be published. All fields are required.

    Top White Papers and Webcasts

    • Lenovo recommends Windows 8 Pro. "I dropped my laptop getting out of the taxi." This probably sounds familiar to most IT professionals. If your employees are traveling, you know their devices are in for a rough go. Whether it's a trip to the conference room or a convention out of town, any time equipment leaves a user's desk it is at risk of being put into harm's way. Stay connected at all times, whether at the office or on the go, with agile, durable, and flexible devices like the Lenovo® …

    • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

    Most Popular Programming Stories

    More for Developers

    RSS Feeds

    Thanks for your registration, follow us on our social networks to keep up-to-date