signal.hpp

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#pragma once
 
#include <unordered_map>
 
template <typename... Args>
class signal_ {
  public:
    using key_type = unsigned;
 
    template <typename F>
    key_type connect(F f) {
        ++counter;
        functors[counter] = f;
        return counter;
    }
 
    void disconnect(unsigned i) {
        auto it = functors.find(i);
        if (it != functors.end()) {
            functors.erase(it);
        }
    }
 
    void send(Args... args) const {
        for (const auto& [i, f]: functors) {
            std::invoke(f, args...);
        }
    }
 
  private:
    key_type counter = 0;
    std::unordered_map<key_type, std::function<void(Args...)>> functors;
};