表驱动事件例子-526互联

#include <iostream>
#include <vector>
#include <map>

typedef int (*EventHandler)(void*);

class EventTable {
public:
    void Register(int event_type, EventHandler handler) {
        handlers_[event_type] = handler;
    }

    EventHandler Lookup(int event_type) const {
        auto it = handlers_.find(event_type);
        if (it != handlers_.end()) {
            return it->second;
        }
        return nullptr;
    }

private:
    std::map<int, EventHandler> handlers_;
};

class EventDispatcher {
public:
    EventDispatcher() : table_() {}

    void Register(int event_type, EventHandler handler) {
        table_.Register(event_type, handler);
    }

    int Dispatch(int event_type, void* event_data) {
        EventHandler handler = table_.Lookup(event_type);
        if (handler) {
            return handler(event_data);
        }
        return -1;
    }

private:
    EventTable table_;
};

int HandleEventA(void* data) {
    std::cout << "Handling Event A" << std::endl;
    return 0;
}

int HandleEventB(void* data) {
    std::cout << "Handling Event B" << std::endl;
    return 0;
}

int main() {
    EventDispatcher dispatcher;

    dispatcher.Register(1, HandleEventA);
    dispatcher.Register(2, HandleEventB);

    std::vector<int> events = {1, 2, 3};

    for (auto event : events) {
        dispatcher.Dispatch(event, nullptr);
    }

    return 0;
}