signal_emitter.hpp

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#ifndef SIGNAL_EMITTER_HPP
#define SIGNAL_EMITTER_HPP
 
#include <functional>
#include <unordered_map>
#include <vector>
#include <typeindex>
#include <any>
#include <iostream>

class SignalEmitter {
  public:
    template <typename Signal>
    void connect(std::function<void(const Signal &)> listener) {
        auto &vec = listeners[typeid(Signal)];
        vec.push_back(listener);
    }

    template <typename Signal>
    void emit(const Signal &signal) {
        auto it = listeners.find(typeid(Signal));
        if (it == listeners.end())
            return;
 
        for (auto &listener_any : it->second) {
            auto &fn = std::any_cast<std::function<void(const Signal &)> &>(listener_any);
            fn(signal);
        }
    }
 
  private:
    std::unordered_map<std::type_index, std::vector<std::any>> listeners;
};
 
#endif // SIGNAL_EMITTER_HPP