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From: "Jakob Bieling" <NOnetsurfSPAM AT gmx DOT net>
Newsgroups: comp.lang.c++,comp.os.msdos.djgpp
Subject: Re: ** Pointer thingie's <= what's up with the double *?
Date: Fri, 14 Dec 2001 12:04:26 +0100
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"Emile Bosch" <emilebosch AT hotmail DOT com> schrieb im Newsbeitrag
news:vTkS7.469287$Jy2 DOT 33400140 AT news DOT quicknet DOT nl...

> void** ptr; //? Double **?
>
> I get the single * but what's up with the ** ??
> just when i tought i got the pointer thingies, they invented this :D lol.

** means pointer-to-pointer. So, ptr would point to a memory location that
points to another memory location. You can also have three or four or more of
those:

long*** ptr;

Now you have a pointer to a pointer that in turn points to another pointer.
Usually, you don't use the *** and rarely use **.

> So can someone help me with this?
> Oh, and if thát's possible is it also possible to have anything like
>
> void *& or something?

Yes. That's a reference to a pointer. You won't see something like long*&& or
something, though. But here too you may use stuff like long**&.

hth
jb