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feat: add Observer Pattern

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XMuli
2022-12-24 01:17:47 +08:00
parent 492370ae45
commit ed401eda98
13 changed files with 453 additions and 16 deletions
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9
Studio/DesignPatterns/DesignPatterns.cpp Normal file
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// DesignPatterns.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
//int main()
//{
// std::cout << "Hello World!\n";
//}

153
Studio/DesignPatterns/DesignPatterns.vcxproj Normal file
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36
Studio/DesignPatterns/DesignPatterns.vcxproj.filters Normal file
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Studio/DesignPatterns/Observer.cpp Normal file
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#include "Observer.h"

106
Studio/DesignPatterns/Observer.h Normal file
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/*******************************************************************
* Copyright (c) 2022~2023 XMuli All rights reserved.
* GitHub: https://github.com/XMuli
* Description: 观察者模式 Observer Pattern
* Reference: 情景 → Subject 发送一个消息，然后所有的 Observer A、B、C
* 都有收到，并且对相同的消息，做出各自不同的操作响应
* See: https://www.cnblogs.com/suzhou/p/dp16obsvr.html
******************************************************************/
#pragma once
#include <iostream>
#include <string>
#include <list>
using namespace std;
class Observer { // 观察者
public:
virtual void update(string msg) = 0;
virtual void doSomeThing() = 0;
protected:
string m_msg;
};
class Subject {
public:
Subject() = default;
virtual ~Subject() = default;
virtual void addObsvr(Observer* obj) = 0;
virtual void removeObsvr(Observer* obj) = 0;
virtual void notify(string msg) = 0;
};
//---------------------------------------------------------
class ConcreteSubject: public Subject {
public:
ConcreteSubject() {};
virtual ~ConcreteSubject() { m_obsvrs.clear(); }
virtual void addObsvr(Observer* obj) override {
m_obsvrs.push_back(obj);
}
virtual void removeObsvr(Observer* obj) override {
m_obsvrs.remove(obj);
}
virtual void notify(string msg) override {
for (const auto& it : m_obsvrs)
it->update(msg);
for (const auto& it : m_obsvrs)
it->doSomeThing();
cout << endl;
}
private:
list<Observer*> m_obsvrs;
};
class AObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "AObserver: 对 " << m_msg << " 进行 A 的操作" << endl; }
};
class BObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "BObserver: 对 " << m_msg << " 进行 B 的操作" << endl; }
};
class CObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "CObserver: 对 " << m_msg << " 进行 C 的操作" << endl; }
};
int main()
{
AObserver* a = new AObserver();
BObserver* b = new BObserver();
CObserver* c = new CObserver();
ConcreteSubject* concreSubject = new ConcreteSubject();
concreSubject->addObsvr(a);
concreSubject->addObsvr(b);
concreSubject->addObsvr(c);
concreSubject->notify("messagebox 1");
concreSubject->removeObsvr(c);
concreSubject->notify("messagebox 2");
//a->doSomeThing();
//b->doSomeThing();
//c->doSomeThing();
return 0;
}
/*****************************打印结果*******************************
AObserver: 对 messagebox 1 进行 A 的操作
BObserver: 对 messagebox 1 进行 B 的操作
CObserver: 对 messagebox 1 进行 C 的操作
AObserver: 对 messagebox 2 进行 A 的操作
BObserver: 对 messagebox 2 进行 B 的操作
******************************************************************/

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Studio/DesignPatterns/Singleton.cpp Normal file
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#include "Singleton.h"

24
Studio/DesignPatterns/Singleton.h Normal file
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/*******************************************************************
* Copyright (c) 2022~2023 XMuli All rights reserved.
* GitHub: https://github.com/XMuli
* Description: 单例模式 Singleton Pattern 的最优雅实现
* Reference: https://zhuanlan.zhihu.com/p/37469260 单例介绍及好一篇
******************************************************************/
#pragma once
// 《Effective C++》提出了一种更优雅的单例模式实现，称为 Meyers' Singleton
class Singleton
{
public:
static Singleton& instance() {
static Singleton instan;
return instan;
}
private:
Singleton() {};
~Singleton() {};
Singleton(const Singleton& obj) = delete;
Singleton& operator=(const Singleton& obj) = delete;
};