量化交易之设计模式篇 - 访问者模式

//
// Created by win10 on 2021/11/16.
//

#include <iostream>
#include <vector>
using namespace std;

/*
 * 访问者模式
 */
class Man;
class Woman;
class Action {
public:
    virtual void getManConclusion(Man* concreteElementA) = 0;
    virtual void getWomanConclusion(Woman* concreteElementB) = 0;
};

class Success: public Action {
public:
    virtual void getManConclusion(Man* concreteElementA) {
        std::cout << __FUNCTION__ << std::endl;
    }
    virtual void getWomanConclusion(Woman* concreteElementB) {
        std::cout << __FUNCTION__ << std::endl;
    }
};

class Failure: public Action {
public:
    virtual void getManConclusion(Man* concreteElementA) {
        std::cout << __FUNCTION__ << std::endl;
    }
    virtual void getWomanConclusion(Woman* concreteElementB) {
        std::cout << __FUNCTION__ << std::endl;
    }
};

class Person {
public:
    virtual void accept(Action* visitor) = 0;
};
class Man: public Person {
public:
    virtual void accept(Action* visitor) {
        visitor->getManConclusion(this);
    }
};
class Woman: public Person {
public:
    virtual void accept(Action* visitor) {
        visitor->getWomanConclusion(this);
    }
};

// 对象结构类
class ObjectStructure {
public:
    void add(Person* person) {
        this->m_personList.push_back(person);
    }
    void display(Action* action) {
        for (auto iterator = this->m_personList.begin(); iterator != this->m_personList.end(); iterator++) {
            (*iterator)->accept(action);
        }
    }

private:
    vector<Person*> m_personList;
};

int main() {

    ObjectStructure* objectStructure = new ObjectStructure();
    objectStructure->add(new Man());
    objectStructure->add(new Woman());

    Success* success = new Success();
    objectStructure->display(success);

    Failure* failure = new Failure();
    objectStructure->display(failure);

    return 0;
}