ATL / WTL / STL

class SharedContent<br />
{<br />
public:<br />
	SharedContent(unsigned short size) : _size(size), _pCotent(new ContentType[_size]), _count(1) { }<br />
<br />
	unsigned short getSize() const { return _size; }<br />
<br />
	ContentType* getContent() const { return _pContent; }<br />
<br />
	void decCount() const {<br />
		_count--;<br />
		if (_count == 0) {<br />
			// destroy this object<br />
			delete [] _pContent;<br />
			delete this;<br />
		}<br />
	}<br />
<br />
	void incCount() const {<br />
		_count++;<br />
	}<br />
<br />
private:<br />
	unsigned short _size;<br />
	ContentType* _pContent;<br />
	mutable int _count;		///< reference count<br />
};<br />
<br />
class ReferenceObject {<br />
public:<br />
	ReferenceObject() : _content(NULL) { }<br />
<br />
	ReferenceObject(unsigned short size) : _content(new SharedContent(size)) { }<br />
<br />
	ReferenceObject(const ReferenceObject& rhs) : _content(NULL) { *this = rhs; }<br />
<br />
	~ReferenceObject() {<br />
		if (_content != NULL) _content->decCount();<br />
	}<br />
<br />
	ReferenceObject& operator=(const ReferenceObject& rhs) {<br />
		// _content is pointed to old content<br />
		if (_content != NULL) _content->decCount();<br />
		_content = rhs._content;<br />
		// _content is pointed to rhs._content now<br />
		if (_content != NULL) _content->incCount();<br />
	}<br />
<br />
	unsigned short getLength() const {<br />
		return _content == NULL ? 0 : _content->getSize();<br />
	}<br />
<br />
	ContentType* getContent() const {<br />
		return _content == NULL ? NULL : _content->getContent();<br />
	}<br />
<br />
	ReferenceObject clone() const {<br />
		return clone(0, getSize());<br />
	}<br />
<br />
	ReferenceObject clone(int offset, int size) const {<br />
		ByteArray result(length);<br />
		memcpy(result.getContent(), getContent() + offset, size);<br />
		return result;<br />
	}<br />
<br />
	// Some other functions<br />
	// ...<br />
<br />
private:<br />
	SharedContent* _content;<br />
};

void addElement(unsigned short size, std::deque<ReferenceObject>& objectQueue) {<br />
	ReferenceObject obj(size);<br />
	objectQueue.push_back(obj);<br />
}<br />
<br />
int main {<br />
	std::deque<ReferenceObject> objectQueue;<br />
	for (int i = 0; i < 10; ++i) {<br />
		addElement(i, objectQueue);<br />
	}<br />
	std::deque<ReferenceObject>::iterator itr = objectQueue.begin();<br />
	while (itr != objectQueue.begin() + 3) {<br />
		ReferenceObject obj = *itr;<br />
		// do something with obj, push to queue B<br />
		++itr;<br />
	}<br />
	objectQueue.erase(objectQueue.begin(), itr);<br />
	return 0;<br />
}

CFrameWindow myWindow ;<br />
myWindow.Create() ;

CFrameWindow *myWindow ;<br />
myWindow->Create() ;