C++ 使用typeid获取对象类信息-优快云博客

本文链接：https://blog.youkuaiyun.com/kodeyang/article/details/12019225

本文介绍了如何在C++中使用`typeid`关键字来获取对象所属的类信息，通过示例代码TypeidLayer.h和TypeidLayer.cpp进行详细说明。

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直接上代码：

TypeidLayer.h

//
//  TypeidLayer.h
//  Demo
//
//  Created by KodeLove on 9/15/13.
//
//

#ifndef __Demo__TypeidLayer__
#define __Demo__TypeidLayer__

#include "cocos2d.h"

USING_NS_CC;

class TypeidLayer : public CCLayer {
    
private:
    
    virtual bool init();
    
public:
    
    CREATE_FUNC(TypeidLayer);
    
};

#endif /* defined(__Demo__TypeidLayer__) */

TypeidLayer.cpp

//
//  TypeidLayer.cpp
//  Demo
//
//  Created by KodeLove on 9/15/13.
//
//

#include "TypeidLayer.h"

/**
 * 执行结果如下：
 *
 * t_iVar 是整型
 * ----------------------------------------
 * t_oLyrTypeid 是 TypeidLayer 类型
 * ----------------------------------------
 * ----------------------------------------
 * *t_pLyrTypeid 是 TypeidLayer 类型
 */
bool TypeidLayer::init() {
    if (!CCLayer::init()) {
        return false;
    }
    
    int t_iVar = 123;
    if (typeid(t_iVar) == typeid(int)) {
        printf("t_iVar 是整型\n");
    }
    
    printf("----------------------------------------\n");
    
    TypeidLayer t_oLyrTypeid;
    if (typeid(t_oLyrTypeid) == typeid(TypeidLayer)) {
        printf("t_oLyrTypeid 是 TypeidLayer 类型\n");
    }
    
    if (typeid(t_oLyrTypeid) == typeid(CCLayer)) {
        printf("t_oLyrTypeid 是 CCLayer 类型\n");
    }
    
    if (typeid(t_oLyrTypeid) == typeid(CCObject)) {
        printf("t_oLyrTypeid 是 CCObject 类型\n");
    }
    
    printf("----------------------------------------\n");
    
    TypeidLayer* t_pLyrTypeid = new TypeidLayer();
    if (typeid(t_pLyrTypeid) == typeid(TypeidLayer)) {
        printf("t_pLyrTypeid 是 TypeidLayer 类型\n");
    }
    
    if (typeid(t_pLyrTypeid) == typeid(CCLayer)) {
        printf("t_pLyrTypeid 是 CCLayer 类型\n");
    }
    
    if (typeid(t_pLyrTypeid) == typeid(CCObject)) {
        printf("t_pLyrTypeid 是 CCObject 类型\n");
    }
    
    if (typeid(t_pLyrTypeid) == typeid(int)) {
        printf("t_pLyrTypeid 是 int 类型\n");
    }
    
    printf("----------------------------------------\n");
    
    if (typeid(*t_pLyrTypeid) == typeid(TypeidLayer)) {
        printf("*t_pLyrTypeid 是 TypeidLayer 类型\n");
    }
    
    if (typeid(*t_pLyrTypeid) == typeid(CCLayer)) {
        printf("*t_pLyrTypeid 是 CCLayer 类型\n");
    }
    
    if (typeid(*t_pLyrTypeid) == typeid(CCObject)) {
        printf("*t_pLyrTypeid 是 CCObject 类型\n");
    }
    
    delete t_pLyrTypeid;
    
    return true;
}