In C, if you want to let a function change a variable (let's call it x), you need to pass it a pointer to x.

If x is a pointer to a pointer (**), in order to let a function edit x, you need to pass it to a pointer to x (in that case, a pointer to a pointer to a pointer ***).

Only real Three Star Programmers can handle this amount of indirection

yo dawg

Imagine the innermost is function pointer.

Are you? This is plain and simple C.

Villain flashback backstory for the Rust movie.

Statements dreamed up by the utterly deranged.