#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
class CDownloadDelegateBase
{
public:
	virtual void Fire(const char*pURL, bool bOK) = 0;
};
template<typename O, typename T>
class CDownloadDelegate : public CDownloadDelegateBase
{
	typedef void (T::*Fun)(const char*, bool);
public:
	CDownloadDelegate(O* pObj = NULL, Fun pFun = NULL) : m_pFun(pFun), m_pObj(pObj) {
	};
	virtual void Fire(const char*pURL, bool bOK)
	{
		if (m_pFun != NULL && m_pObj != NULL)
		{
			(m_pObj->*m_pFun)(pURL, bOK);
		}
	}
private:
	Fun m_pFun;
	O* m_pObj;
};
template<typename O, typename T>
CDownloadDelegate<O, T>* MakeDelegate(O* pObject, void(T::*pFun)(const char* pURL, bool))
{
	return new CDownloadDelegate<O, T>(pObject, pFun);
}
class CDownloadEvent
{
public:
	~CDownloadEvent() {
		vector<CDownloadDelegateBase*> ::iterator itr = m_arDelegate.begin();
		while (itr != m_arDelegate.end())
		{
			delete *itr;
			++itr;
		}
		m_arDelegate.clear();
	}
	void operator += (CDownloadDelegateBase* p)
	{
		m_arDelegate.push_back(p);
	}
	void operator -= (CDownloadDelegateBase* p)
	{
		ITR itr = remove(m_arDelegate.begin(), m_arDelegate.end(), p);
		ITR itrTemp = itr;
		while (itrTemp != m_arDelegate.end())
		{
			delete *itr;
			++itr;
		}
		m_arDelegate.erase(itr, m_arDelegate.end());
	}
	void operator ()(const char* pURL, bool bOK)
	{
		ITR itrTemp = m_arDelegate.begin();
		while (itrTemp != m_arDelegate.end())
		{
			(*itrTemp)->Fire(pURL, bOK);
			++itrTemp;
		}
	}
private:
	vector<CDownloadDelegateBase*> m_arDelegate;
	typedef vector<CDownloadDelegateBase*>::iterator ITR;
};
class CMyDownloaderEx
{
public:
	void DownloadFile(const char* pURL)
	{
		cout << "downloading:" << pURL << "..." << endl;
		downloadEvent(pURL, true);
	}
	//相当于下载事件，先让它成为代理，才能去下载东西
	CDownloadEvent downloadEvent;
};
class CMyFileEx
{
public:
	void download()
	{
		CMyDownloaderEx downloader;
		downloader.downloadEvent += MakeDelegate(this, &CMyFileEx::OnDownloadFinished);
		downloader.DownloadFile("www.baidu.com");
	}
	virtual void OnDownloadFinished(const char* pURL,bool bOK)
	{
		cout << "OnDownloadFinished,URL:" << pURL << " status:" << bOK << endl;
	}
};
int main()
{
	CMyFileEx ff;
	ff.download();
	system("pause");
}