c++11のlambdaでイベントハンドラ

jsっぽいイベントハンドラがけっこう短いコードで実現できる。

# include <iostream>
# include <functional>
# include <string>
# include <map>
# include <vector>

using namespace std;

struct Event {
    Event(const string& name, int data)
        : name(name),
          data(data) {
    }

    string name;
    int data;
};

typedef function<bool(const Event&)> EventHandler;

int main(int argc, char **argv) {
    // set evnet queues
    vector<Event> queues;
    queues.emplace_back("hoge", 100);
    queues.emplace_back("hoge", 101);

    // set handlers
    multimap<string, EventHandler> handlers;

    handlers.emplace("hoge", [](const Event& e) {
            cout << "emit hoge event!!!" << e.data << endl;
            return true;
        });

    handlers.emplace("moge", [](const Event& e) {
            cout << "emit moge event!!!" << e.data << endl;
            return true;
        });

    // trigger 
    for (auto event : queues) {
        for (auto iter : handlers) {
            if (event.name == iter.first) {
                iter.second(event);
            }
        }
    }

    return 0;
}