refobject.h

#ifndef REFOBJECT_H_
#define REFOBJECT_H_

class WXDLLIMPEXP_FREECHART RefObject
{
public:
    RefObject()
    {
        refCount = 0;
    }

    virtual ~RefObject()
    {
        if (refCount > 0) {
            wxLogError(wxT("RefObject::~RefObject: object still have references. refCount=%i"), refCount);
        }
    }

    void AddRef()
    {
        refCount++;
    }

    void Unref()
    {
        refCount--;
        if (refCount < 0) {
            wxLogError(wxT("RefObject::Unref: refCount < 0"));
        }
    }

    int RefCount()
    {
        return refCount;
    }

private:
    int refCount;
};

#define SAFE_UNREF(ptr) do {                            \
    if (ptr != NULL) {                                  \
        ptr->Unref();                                   \
        if (ptr->RefCount() <= 0) {                     \
            delete ptr;                                 \
        }                                               \
    }                                                   \
    ptr = NULL;                                         \
} while (0)

#define SAFE_REPLACE_UNREF(dst, src) do {               \
    SAFE_UNREF(dst);                                    \
    if (src != NULL)                                    \
        ((RefObject *)src)->AddRef();                   \
    dst = src;                                          \
} while (0)

#define SAFE_UNREF_ELEMENTS(arrPtr, arrSize) do {   \
    if (arrPtr != NULL) {                               \
        for (int n = 0; n < arrSize; n++) {             \
            SAFE_UNREF(arrPtr[n]);                      \
        }                                               \
        wxDELETEA(arrPtr);                              \
    }                                                   \
} while (0)

#endif /*REFOBJECT_H_*/