Reference Counting

From:
PeterAPIIT@gmail.com
Newsgroups:
comp.lang.c++
Date:
Sat, 20 Sep 2008 02:34:49 -0700 (PDT)
Message-ID:
<afa88144-0c31-49a4-b9f4-079f529d73f3@w24g2000prd.googlegroups.com>
Hello to all expect C++ programmer, recently i have developed a smart
pointer class but i don't know how to implement a reference counting.

My smart pointer is non-intrusive smart pointer.

My question is
1. I need a simple reference count ptr class
2. Does cyclic reference counting can be solved ?
3. Does policy based design is good approaches in smart pointer ?
4. What should i define in smart pointer template class ?
5. Does smart pointer syntax correct ?

In STL, there just write class U = XXX but why i need the template
<class>. What this mean ?

I know what is template.

This is my code so far.

[code]

template <typename T,
            template <class aType>
            class StoragePolicy = DefaultSPStorage,

            template <class >
            class OwnershipPolicy = RCPtr,

            template <class>
            class ConversionPolicy = DisallowConversion
         >

class smart_ptr{};

#ifndef STORAGE_POLICY
#define STORAGE_POLICY

template <class aType>
class DefaultSPStorage
{
private:

    /*
        SmartPtr passes StoragePolicy<T>::T*
        to Ownership- Policy.
    */
    aType * pImpl;

public:
    DefaultSPStorage () : pImpl(new aType())
    {
    }

    explicit DefaultSPStorage<aType>(aType* pointee) : pImpl(pointee)
    {
        if (!pointee) throw NullPointerException();
    }

    DefaultSPStorage<aType>& operator=(const DefaultSPStorage<aType>&
rhs)
    {
    }

    ~DefaultSPStorage<aType>()
    {

    }

    aType* operator->()
    {
        if (pImpl != 0)
        {
            return pIpml;
        }
    }

    aType& operator*()
    {
        return *pImpl;
    }

    aType* GetImpl(const DefaultSPStorage & that)
    {
        return that.pImpl;
    }

    aType& GetImplRef(const DefaultSPStorage & that)
    {
        return that.pImpl;
    }

    /* storageImpl.Destroy()

    */
};

#endif

#ifndef RCPTR
#define RCPTR

template <class sameType>
class RCPtr
{

private:
    unsigned int* referenceCountPtr;

public:

    RCPtr<sameType>() : refereceCountPtr(new unsigned int(1))
    {
    }

    RCPtr<sameType>(const RCPtr & that)
    {
        unsigned int *temp = new unsigned int(1);

        temp = that.referenceCountPtr;
        referenceCountPtr = temp;
    }

    RCPtr<sameType>& operator=(const RCPtr<sameType>& rhs)
    {
    }

    ~RCPtr<sameType>()
    {
        delete referenceCountPtr;
    }

    /*
        IncreaseRef
        DecreaseRef

        Realease

    */

    /* The Ownership policy must support
        intrusive as well as nonintrusive
        reference counting.

        Therefore, deallocation of memory is
        called by functionrather than
        implicitly destructor called because
        it can explicit called by user
    */
};

#endif

[/code]

My question is do you all have some instructions how to create the
reference counting ptr class.(What to do for non-intrusive smart
pointer).

 hope you all can help.

A billion thanks for your help.

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