学习笔记：动态分派和静态分派

最新推荐文章于 2025-06-17 00:15:00 发布

audi2

最新推荐文章于 2025-06-17 00:15:00 发布

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本文链接：https://blog.youkuaiyun.com/audi2/article/details/41928305

本文深入探讨了面向对象编程原则及其在软件开发中的实践应用，包括类、继承、封装、多态等核心概念。同时，文章详细介绍了设计模式，如工厂模式、观察者模式、单例模式等，阐述了它们如何解决常见编程问题并提高代码的可维护性和可扩展性。

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#include "stdafx.h"
#include <iostream>

struct CEmployee;
struct CProgrammer;
struct CJuniorProgrammer;
struct CVeteranProgrammer;
struct CManager;
struct CCEO;

class IVisitor{
public:
    virtual void Visit(CEmployee* p) = 0;
    virtual void Visit(CProgrammer* p) = 0;
    virtual void Visit(CJuniorProgrammer* p) = 0;
    virtual void Visit(CVeteranProgrammer* p) = 0;
    virtual void Visit(CManager* p) = 0;
    virtual void Visit(CCEO* p) = 0;
};

#define FIRST_DISPATCH \
virtual void Accept(IVisitor *v){ v->Visit(this);}

#define SECOND_DISPATCH \
    virtual void Visit(CEmployee* p         ) {visit_helper(p);} \
    virtual void Visit(CProgrammer* p       ) {visit_helper(p);} \
    virtual void Visit(CJuniorProgrammer* p ) {visit_helper(p);} \
    virtual void Visit(CVeteranProgrammer* p) {visit_helper(p);} \
    virtual void Visit(CManager* p          ) {visit_helper(p);} \
    virtual void Visit(CCEO* p              ) {visit_helper(p);} \

struct CEmployee{
  FIRST_DISPATCH
};

struct CProgrammer : public CEmployee{
  FIRST_DISPATCH
};

struct CJuniorProgrammer : public CProgrammer{
 FIRST_DISPATCH
};

struct CVeteranProgrammer : public CProgrammer{
  FIRST_DISPATCH
};

struct CManager : public CEmployee{
  FIRST_DISPATCH
};

struct CCEO : public CEmployee{
  FIRST_DISPATCH
};



class SalaryVisitor:public IVisitor{
public:
    //通过宏定义，帮助实现更便利的书写
    SECOND_DISPATCH

    //help函数的作用是：避免对每个子类都写代码
    void visit_helper(CEmployee* p){
        std::cout << "默认的算法，相当于default或者else" << std::endl;
    }

    void visit_helper(CProgrammer* p){
        std::cout << "程序员基类。对一小类做“特殊处理”）" << std::endl;
    }

    void visit_helper(CCEO* p){
        std::cout << "对具体的某个类做“特殊处理”）" << std::endl;
    }
};
int main() {

    IVisitor* pv = new SalaryVisitor();
    CEmployee* pe = new CVeteranProgrammer();
    pe->Accept(pv);
    return 0;
}