Function object parameters

file.cpp

/*

I have a function object or function F (given by user).
I want to calculate number of parameters that F takes.
Or I want to store parameters in parameter pack
Or apply some operations on parameters like, 
check if first parameter (or nth parameter) is ref or
const ref or value etc..

*/

struct add_one
{
    template <typename T>
    T operator()(T const& v)
    {
        return v + 1;
    }
};

/*
Suppose here add_one is the function object then, is there
any way to know if v is taken by reference or value etc...
add_one is supplied by user.
/*