Why can't operator () of stateless functor be static?

Question

Why is operator () of stateless functor not allowed to be static? Stateless lambda objects are convertible to pointers to free functions having the

Answer 1

I would think that there's no technical reason to forbid this (but not being familiar with the de-facto cross-vendor C++ ABI (Itanium ABI), I can't promise anything).

There's however an evolutional issue about this at https://cplusplus.github.io/EWG/ewg-active.html#88 . It even has the [tiny] mark on it, making it a somewhat "trivial" feature under consideration.