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我觉得这是最有意思的模式#xff0c;其中一个动#xff0c;另外的自动跟着动。发布-订阅#xff0c;我觉得很巧妙。
代码
头文件
#pragma once
#includevector
#includestring
#includeiostream// 抽象观察者
class Aobserver
{
public:v…前言
我觉得这是最有意思的模式其中一个动另外的自动跟着动。发布-订阅我觉得很巧妙。
代码
头文件
#pragma once
#includevector
#includestring
#includeiostream// 抽象观察者
class Aobserver
{
public:virtual void update(std::string updated_state) 0;
};// 抽象通知者
class Asubject
{
protected:std::vectorAobserver* _pObservers;bool whetherRegist(Aobserver* p_observer){for (auto it : _pObservers) {if (it p_observer) return true;}return false;}public:virtual void registObserver(Aobserver* p_observer) 0;virtual void detachObserver(Aobserver* p_observer) 0;virtual void notify(const std::string teacher_name) 0;};// 具体通知者
class Csubject1 : public Asubject
{
private:std::string _subjectName;public:Csubject1(const std::string subject_name) :_subjectName(subject_name) {}// 注册观察者void registObserver(Aobserver* p_observer) override{if (p_observer!nullptr whetherRegist(p_observer) false) {_pObservers.push_back(p_observer);}}void detachObserver(Aobserver* p_observer) override{if (p_observer ! nullptr){for (auto it : _pObservers) {if (it p_observer) {_pObservers.erase(std::remove(_pObservers.begin(),_pObservers.end(),it),_pObservers.end());}}}}void notify(const std::string teacher_name) override{std::string notify_state _subjectName say: teacher_name is coming!;for (auto it : _pObservers) {it-update(notify_state);}}
};// 具体观察者
class Hablee : public Aobserver
{
private:void cancleReading(std::string updated_state){std::cout updated_state;std::cout you should stop reading std::endl;}public:void update(std::string updated_state) override{this-cancleReading(updated_state);}};class Yuki : public Aobserver
{
private:void canclePlayingGuitar(std::string updated_state){std::cout updated_state;std::cout you should stop plaing guitar std::endl;}public:void update(std::string updated_state) override{this-canclePlayingGuitar(updated_state);}
};main.cpp
#includeiostream
#includeAobserver.hint main()
{Csubject1 wzq(wangZhaoQi); // 通知者Hablee lhb; wzq.registObserver(lhb);Yuki wwy;wzq.registObserver(wwy);wzq.notify(lyj);wzq.notify(xiaoZhang);wzq.detachObserver(lhb);wzq.notify(lyj);return 0;
}
