why is there no std::make_function()?

Question

std::function<> is a useful wrapper around almost any callable thing, including free functions, lambdas, functors, member functions, results from st

Answer 1

class multi_functor
{
  public:
    void operator()(int) { std::cout << "i'm int" << std::endl }
    void operator()(double) { std::cout << "i'm double" << std::endl }
};

int main(void)
{
  auto func = make_function(multi_functor());
}

Because what would be the type of func here ?

This ambiguity applies to all functor objects (which includes bind return values and lambdas), which would make make_function only usable on function pointers.