variadic template class to make a deferred call to a variadic template function

Question

I can create a template class that stores some values in a property and let me later call a method that call a function with this arg. Like this :

template <         


        

Answer 1

You may use something like the following:

template  class B
{
public:
    std::tuple t;
    B(Ts... args)
        : t(args...)
    {
    }
    void m() { call_f(std::index_sequence_for()); }

private:
    template 
    void call_f(std::index_sequence)
    {
        f(std::get(t)...);
    }
};

Note that std::index_sequence_for (std::make_index_sequence) and std::index_sequence are C++14 but may be written in C++11.

Live example.