function that returns a void pointer to itself?

Question

I was thinking that in python it's pretty simple to make a function that returns itself, but it seems to be much harder to do something like that in c++.
So I'm wondering if it's possible to make a function fun
void * fun()
where
(void*)&fun==fun()

Answer 1

A function is just a lot of instructions in memory, when you call some the CPU jumps into
memory's index where the first function's commands are then the CPU read all instructions until have to jump again.

Python is an interpreted language, the interpreter can link the function's name with some object in memory

C++ is compiled, so pointing for the first function's instruction would work. One way I think is: tells the compiler (i don't know how) that you want it. By coding... Seems impossible for me. In assembly it is pretty simple

Answer 2

It looks like you are trying to make reference to function, what do you mean by "function that returns itself"? Do you think of recursive functions?

Answer 3

Mirielle[ INACTIVE ]
Michał Doruch
I want to do a slightly different thing than I did in python
in python I did

li = [lambda l: lambda: l[0]]
li[0] = li[0](li)
autoreturner = li[0]
del li
assert autoreturner == autoreturner()

this creates a completely useless function "autoreturner" that just returns itself, so autoreturner==autoreturner()==autoreturner()()
I wanted to make something similar in c++, but it's not easy since it is strongly typed, so I'd need to return a function pointer that can't exist (the type of the pointer includes the return type of the function, and to make this you'd need to make a type that's defined recursively, which I'm pretty certain is impossible in c++), but you can cast function pointers to void pointers, so what I wanted to do was make a function that, when called, returns a void pointer to its own position in memory
so (void*)&fun==fun()

Answer 4

Igor Padilha dos Santos yeah, I figured I could ask around to see if anyone had ideas, but it's probably impossible :( thanks anyway