Cocos2d-x的入口：

CCApplicationProtocol接口：定义通用接口

// CCApplicationProtocol.h
#pragma once
 
class CCApplicationProtocol
{
public:
    CCApplicationProtocol();
    virtual ~CCApplicationProtocol();
 
    virtual bool applicationDidfinishLauching() = 0;
};

CCApplication处理跨平台特性：

//CCApplication.h
#pragma once
#include "CCApplicationProtocol.h"
 
class CCApplication : public CCApplicationProtocol
{
public:
    CCApplication();
    virtual ~CCApplication();
 
    int run();
 
    static CCApplication* sharedApplication();
 
    static CCApplication* sm_pSharedApplication;
 
};

//CCApplication.cpp
 
#include "CCApplication.h"
#include "stddef.h"
 
CCApplication* CCApplication::sm_pSharedApplication = NULL;
 
CCApplication::CCApplication()
{
    sm_pSharedApplication = this;//子类对象，其实就是APPDelegate对象
}
 
 
CCApplication::~CCApplication()
{
}
 
int CCApplication::run()
{
    applicationDidfinishLauching();
 
    return 0; 
}
 
CCApplication* CCApplication::sharedApplication()
{
    if (sm_pSharedApplication != NULL)
        return sm_pSharedApplication;
    else
        return NULL;
}

APPDelegate实现CCApplication

//AppDelegate.h
 
#pragma once
#include "CCApplication.h"
 
class AppDelegate : private CCApplication
{
public:
    AppDelegate();
    virtual ~AppDelegate();
 
    //主要实现CCApplicationProtocol中的接口
    virtual bool applicationDidfinishLauching();
};

//AppDelegate.cpp
 
#include "AppDelegate.h"
#include <iostream>
 
 
AppDelegate::AppDelegate()
{
}
 
 
AppDelegate::~AppDelegate()
{
}
 
//此方法才是程序的真正入口
bool AppDelegate::applicationDidfinishLauching()
{
    std::cout << "Game Start..." << std::endl;
 
    return true;
}

测试程序：

//main.cpp
 
#include <iostream>
#include "CCApplication.h"
#include "AppDelegate.h"
 
void main()
{
 
    AppDelegate app;//完成CCApplication的初始化
 
    //app初始化了CCApplication的静态成员sm_pSharedApplication
    //CCApplication::sharedApplication()得到的就是sm_pSharedApplication
    //然后CCApplication调用自身的run方法，run()中调用CCApplicationProtocol接口中的虚方法，而这些虚方法最终是在APPDelegate中的实现的。
    CCApplication::sharedApplication()->run();
 
    system("pause");
}