C++设计模式中的观察者模式一起来看看

设计模式：观察者模式

观察者模式也称发布订阅模式，发布者发布消息，订阅者接收消息。

#ifndef __obrverpatterns_publish_hpp__#define __obrverpatterns_publish_hpp__#include "obrverpatterns_subscribe.hpp"class obrverpatterns_publish{public:    virtual void registerobjectsubscribe(obrverpatterns_subscribe *ops) = 0;    virtual void removeobjectsubscribe(obrverpatterns_subscribe *ops) = 0;    virtual void notifyobjectsubscribe() = 0;};#endif

#ifndef __obrverpatterns_subscribe_hpp__#define __obrverpatterns_subscribe_hpp__#include "obrverpatterns_common.hpp"class obrverpatterns_subscribe{public:    virtual void update(const obrverpatterns_msgpackage &opmp) = 0;};#endif

#ifndef __obrverpatterns_object_publish_hpp__#define __obrverpatterns_object_publish_hpp__#include <unordered_t>#include "obrverpatterns_publish.hpp"class obrverpatterns_object_publish : public obrverpatterns_publish{private:    obrverpatterns_msgpackage _opmp;    std::unordered_t<obrverpatterns_subscribe *> _subscribeobjectbucket;public:    obrverpatterns_object_publish();    ~obrverpatterns_object_publish();    void registerobjectsubscribe(obrverpatterns_subscribe *ops);    void removeobjectsubscribe(obrverpatterns_subscribe *ops);    void notifyobjectsubscribe();    void tmsgpackage(const obrverpatterns_msgpackage &opmp);};obrverpatterns_object_publish::obrverpatterns_object_publish(){}obrverpatterns_object_publish::~obrverpatterns_object_publish(){}void obrverpatterns_object_publish::registerobjectsubscribe(obrverpatterns_subscribe *ops){    _subscribeobjectbucket.inrt(ops);}void obrverpatt一只绣花鞋erns_object_publish::removeobjectsubscribe(obrverpatterns_subscribe *ops){    _subscribeobjectbucket.era(ops);}void obrverpatterns_object_publish::notifyobjectsubscribe(){    for (auto &&_sob : _subscribeobjectbucket)        _sob->update(_opmp);}void obrverpatterns_object_publish::tmsgpackage(const obrverpatterns_msgpackage &opmp){    _opmp = opmp;    notifyobjectsubscribe();}#endif

#ifndef __obrverpatterns_object_subscribe_hpp__#define __obrverpatterns_object_subscribe_hpp__#include "obrverpatterns_publish.hpp"#include "obrverpatterns_subscribe.hpp"class obrverpatterns_object_subscribe : public obrverpatterns_subscribe{private:    obrverpatterns_msgpackage _opmp;    obrverpatterns_publish *_opb;public:    obrverpatterns_object_subscribe(obrverpatterns_publish *opb);    ~obrverpatterns_object_subscribe();    void update(c被子植物生殖过程onst obrverpatterns_msgpackage &opmp);};obrverpatterns_object_subscribe::obrverpatterns_object_subscribe(obrverpatterns_publish *opb)    :_opb(opb){    _opb->registerobjectsubscribe(this);}obrverpatterns_object_subscribe::~obrverpatterns_object_subscribe(){    _怎么破解空间相册密码opb->removeobjectsubscribe(this);}void obrverpatterns_object_subscribe::update(const obrverpatterns_msgpackage &opmp){    _opmp = opmp;    printf("url:%s, msg:%s\n", _opmp.url.c_str(), _opmp.msg.c_str());}#endif

#ifndef __obrverpatterns_object_subscribe2_hpp__#define __obrverpatterns_object_subscribe2_hpp__#include "obrverpatterns_publish.hpp"#include "obrverpatterns_subscribe.hpp"class obrverpatterns_object_subscribe2 : public obrverpatterns_subscribe{private:    obrverpatterns_msgpackage _opmp;    obrverpatterns_publish *_opb;public:    obrverpatterns_object_subscribe2(obrverpatterns_publish *opb);    ~obrverpatterns_object_subscribe2();    void update(const obrverpatterns_msgpackage &opmp);};obrverpatterns_object_subscribe2::obrverpatterns_object_subscribe2(obrverpatterns_publish *opb)    :_opb(opb){    _opb->registerobjectsubscribe(this);}obrverpatterns_object_subscribe2::~obrverpatterns_object_subscribe2(){    _opb->removeobjectsubscribe(this);}void obrverpatterns_object_subscribe2::update(const obrverpatterns_msgpackage &opmp){    _opmp = opmp;    printf("url:%s, msg:%s\n", _opmp.url.c_str(), _opmp.msg.c_str());}#endif

#ifndef __obrverpatterns_common_hpp__#define __obrverpatterns_common_hpp__#include <string>struct obrverpatterns_msgpackage{    std::string url;    std::string 等待绽放msg;};typedef struct obrverpatterns_msgpackage obrverpatterns_msgpackage;#endif

/************************************************************************    > file name: obrverpatterns_main.cpp    > author:     > mail:     > created time: ************************************************************************/#include "obrverpatterns_common.hpp"#include "obrverpatterns_object_publish.hpp"#include "obrverpatterns_object_subscribe.hpp"#include "obrverpatterns_object_subscribe2.hpp"using namespace std;int main(int argc, char *argv[]){    obrverpatterns_object_publish *opop = new obrverpatterns_object_publish;        obrverpatterns_msgpackage opmp1, opmp2;    opmp1.url = "www.aaa.com";    opmp1.msg = "hello!";    opmp2.url = "www.xyzxyz.com";    opmp2.msg = "hello, obrverpatterns!";        obrverpatterns_object_subscribe *oposa = new obs如烟往事俱忘却erverpatterns_object_subscribe(opop);    obrverpatterns_object_subscribe *oposb = new obrverpatterns_object_subscribe(opop);    obrverpatterns_object_subscribe2 *oposc = new obrverpatterns_object_subscribe2(opop);    obrverpatterns_object_subscribe2 *oposd = new obrverpatterns_object_subscribe2(opop);    opop->tmsgpackage(opmp1);    opop->tmsgpackage(opmp2);        delete oposa;    delete opop;    return 0;}