Can I generate a function without providing arguments?

Question

So c++17 has std::function Deduction Guides so given:

int foo();

I can do:

std::function bar(foo);

But I\

Answer 1

Your question has some most important part in the end in the fine print. If your foo is a template, C++17 deduction guides won't help you with a simple syntax like

std::function f(foo);

You'd still need to provide template arguments for foo. Assuming you are OK with specifying foo's argument types (as you have to be) writing make_func is a trivial exercise:

 template
 auto make_func(R (*ptr)(ARGS...)) {
      return std::function(ptr);
 }

And than you use it:

auto bar = make_func(&foo);