I need something like function-pointers, but with more flexibility and/or thread-safety; is there another way?, C++ FAQ

C++ FAQ

From Marshall Cline: Bjarne Stroustrup, Herb Sutter, Andrei Alexandrescu, Pearson / Addison-Wesley Publishers and I collaborated to create a new C++ Super-FAQ! It's a team effort, with huge contributions from each of us and with amazing support from dozens of brilliant editors. The result is "awesomer" than ever! I originally wrote/published the FAQ in 1991 and now look forward to this new phase - and to continue working with it for another 20 years!

On a personal note, I'm at Oculus VR and it is amazing - fabulous people doing fabulous work. We're hiring more fabulous people so write me if that's you!

FAQ: I need something like function-pointers, but with more flexibility and/or thread-safety; is there another way? ←(in the new Super-FAQ)

It's in Section: Pointers to member functions:

FAQ: Is the type of "pointer-to-member-function" different from "pointer-to-function"?
FAQ: How do I pass a pointer-to-member-function to a signal handler, X event callback, system call that starts a thread/task, etc?
FAQ: Why do I keep getting compile errors (type mismatch) when I try to use a member function as an interrupt service routine?
FAQ: Why am I having trouble taking the address of a C++ function?
FAQ: How can I avoid syntax errors when creating pointers to members?
FAQ: How can I avoid syntax errors when calling a member function using a pointer-to-member-function?
FAQ: How do I create and use an array of pointer-to-member-function?
FAQ: How do I declare a pointer-to-member-function that points to a const member function?
FAQ: What is the difference between the .* and ->* operators?
FAQ: Can I convert a pointer-to-member-function to a void*?
FAQ: Can I convert a pointer-to-function to a void*?
FAQ: I need something like function-pointers, but with more flexibility and/or thread-safety; is there another way? (this FAQ)
FAQ: What the heck is a functionoid, and why would I use one?
FAQ: Can you make functionoids faster than normal function calls?
FAQ: What's the difference between a functionoid and a functor?