单例模式实现

#pragma once

template <typename T>
class CSingletonT
{
public:
    static T *Instance()
    {
        return m_pObj;
    }

    class CDeconstructor
    {
    public:
        CDeconstructor()
        {
            if (NULL == m_pObj)
            {
                m_pObj = new T();
            }
        }

        ~CDeconstructor()
        {
            if (CSingletonT::m_pObj)
            {delete CSingletonT::m_pObj;
                CSingletonT::m_pObj = NULL;
            }
        }
    };

protected:
    CSingletonT(void){}
    virtual ~CSingletonT(void){}

protected:
    static T * m_pObj;
    static CDeconstructor m_dec;
};

#pragma once
#include "WebRef.h"
#include "SingletonT.h"

using Service1::CService1;


class CWebAccess : public CSingletonT<CWebAccess>
{
    friend class CSingletonT<CWebAccess>;
    friend class CSingletonT<CWebAccess>::CDeconstructor;
public:
    
    CService1 *GetService();
    void SetServiceUrl(const CString& strUrl);
protected:
    CService1 m_service;
    virtual ~CWebAccess(void){}
    CWebAccess(void){}
};


CSingletonT<CWebAccess>::CDeconstructor CSingletonT<CWebAccess>::m_dec;
CWebAccess* CSingletonT<CWebAccess>::m_pObj = NULL;