How to pass a template function in a template argument list

Question

Suppose I have a template function:

template
T produce_5_function() { return T(5); }

How can I pass this ent

Answer 1

How about wrapping that function?

template
struct produce_5_function_wrapper {
    T operator()() const { return produce_5_function(); }
};

Then you can use the wrapper instead of the function:

int five = client_template< produce_5_function_wrapper >()();

Using the template function alone will not work, there's no such thing as "template template functions".