EventSystem（事件派发-观察者模式）

EventSystem（事件派发-观察者模式）

观察者模式学习链接：https://blog.csdn.net/qq135595696/article/details/121481732

  可自定义主题（结构体），对应观察者事件可以通过订阅主题收到发布者消息，同时该主题也作为消息结构传入发布者事件中。

#include 
#include 
#include 

namespace {
    //主题（同时也是函数的参数）
    struct Test1 {
        int a;
        int b;
    };


    struct Test2 {
        int c;
        int d;
    };
}


class EventSystem {
public:
    static EventSystem* Ins() {
        static EventSystem ins;
        return &ins;
    }

    template<typename T>
    bool PushEvent(void* pFunc) {
        m_unMaps[typeid(T).name()].push_back(pFunc);
        return true;
    }

    template<typename T>
    bool CallEvent(T* data) {
        typedef void(*FuncType)(T const*);

        auto iter = m_unMaps.find(typeid(T).name());
        for (auto item = iter->second.begin(); item != iter->second.end(); item++) {
            FuncType event = (FuncType)(*item);
            event(data);
        }

        return true;
    }

private:
    EventSystem()  {}
    ~EventSystem() {}

private:
    std::unordered_map<const char*, std::vector<void*>> m_unMaps;
};


//订阅Test1，即此处为观察者观察主题
void Test(Test1* const test) {
    std::cout << "Test:" << test->a << " " << test->b << std::endl;
}

void TestP(Test1* const test) {
    std::cout << "TestP:" << test->a << " " << test->b << std::endl;
}


//订阅Test2，即此处为观察者观察主题
void TestP1(Test2* const test) {
    std::cout << "TestP:" << test->c << " " << test->d << std::endl;
}

int main() {
    //订阅Test1消息
    EventSystem::Ins()->PushEvent<Test1>(Test);
    EventSystem::Ins()->PushEvent<Test1>(TestP);

    //发布者发布消息，订阅Test1的观察者都能收到消息
    Test1 test{ 1,2 };
    EventSystem::Ins()->CallEvent<Test1>(&test);


    //订阅Test2消息
    EventSystem::Ins()->PushEvent<Test2>(TestP);

    //发布者发布消息，订阅Test2的观察者都能收到消息
    Test2 test1{ 3333,5555 };
    EventSystem::Ins()->CallEvent<Test2>(&test1);
    return 0;
}
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