Container for different functions?

Question

I\'m trying to implement a container class for different functions where I can hold function pointers and use it to call those functions later. I\'ll try to discribe my problem

Answer 1

You may do something like:

class BaseFunc {
public:
    virtual ~BaseFunc() = default;

    virtual void Call(std::vector<boost::variant<int, double>>& args_vec) const = 0;
};

template <typename F> class Function;

template <typename R, typename... Args> class Function<R(Args...)> : public BaseFunc
{
public:
    Function(R (*f)(Args...)) : f(f) {}
    void Call(std::vector<boost::variant<int, double>>& args_vec) const override
    {
        Call(args_vec, std::index_sequence_for<Args...>());
    }
private:
    template <std::size_t ... Is>
    void Call(
        std::vector<boost::variant<int, double>>& args_vec,
        std::index_sequence<Is...>) const
    {
        // Add additional check here if you want.
        f(boost::get<Args>(args_vec.at(Is))...);
    }

private:
    R (*f)(Args...);
};

Live example