Make a code "forwarding referencable"

I opened this post about forwarding reference, this is a (hopefully) MCVE code:

#include <functional>
#include <vector>

using namespace std;
struct MultiMemoizator {
    template <typename ReturnType, typename... Args>
    ReturnType callFunction(std::function<ReturnType(Args...)> memFunc, Args&&... args) {

    }
};

typedef vector<double> vecD;

vecD sort_vec (vecD const& vec) {
    return vec;
}

int main()
{
    vecD vec;
    std::function<vecD(vecD)> sortFunc(sort_vec);
    MultiMemoizator mem;
    mem.callFunction<vecD, vecD>(sortFunc, vec);
}

Since this is not the whole code, maybe I'll have to add extra code based on the answers.

Anyway, as was suggested in this answer, forwarding reference is not possible with this version, since Args is not deduced.

So my question is: is it possible to make this code "forwarding referencable"?