C/C++ 撸一段流行的观察者模式

最近把智能指针这块东西捡起，随便就撸了个观察者，主要目的还是练习下几个智能指针，unique_ptr，shared_ptr，weak_ptr等。

//2017年11月6日 21:25:38#include <vecotr>#include <iostream>using namespace std;class Base{public:    Base() noexcept{}    virtual ~Base(){}    virtual void Func() {}};class Derived:public Base{public:    Derived() noexcept {}    virtual void Func() { cout << "Derived1:Notify success" << endl; }};class Derived2 :public Base{public:    Derived2() noexcept {}    virtual void Func() { cout << "Derived2:Notify success" << endl; }};enum class MakeType:unsigned int{DERIVED1,DERIVED2};class Factory{public:    auto MakeObject(MakeType type,void *lparam=nullptr,void *wParam=nullptr)    {        auto Del = [&](Base*pBase) {delete pBase; };        unique_ptr<Base,decltype(Del)> uPtr(nullptr,Del);        switch (type)        {        case MakeType::DERIVED1:            uPtr.reset(new Derived());            break;        case MakeType::DERIVED2:            uPtr.reset(new Derived2());            break;        default:            break;        }        return uPtr;    }    void NotifyAllFunc()    {        for (weak_ptr<Base> wPtr:m_vec)        {            shared_ptr<Base> sPtr= wPtr.lock();            if (!wPtr.expired() && sPtr)            {                sPtr.get()->Func();            }        }    }    void AddFunc(shared_ptr<Base> pBase) {        m_vec.push_back(pBase);    }    vector<weak_ptr<Base>> m_vec;};int main(){    Factory fac;//造一个工厂    shared_ptr<Base> pObj1 = fac.MakeObject(MakeType::DERIVED1);//造一个目标1    shared_ptr<Base> pObj2 = fac.MakeObject(MakeType::DERIVED2);//造一个目标2    fac.AddFunc(pObj1);//添加到观察者    fac.AddFunc(pObj2);//添加到观察者    fac.NotifyAllFunc();//调用所有的被观察对象    return 0;}

撸成功：

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